William T. Joines

Journal Article IEEE Wireless Communications Letters · January 1, 2025 Channel state information (CSI) is usually estimated by the user equipment (UE) and fed back to the base station (BS). The quality of the CSI received by the BS significantly impacts the performance of large-scale multiple-input-multiple-output (MIMO) syst ... Full text Cite

An Adaptive Evolutionary Neural Network-Based Optimization Design Method for Wideband Dual-Polarized Antennas

Journal Article IEEE Transactions on Antennas and Propagation · October 1, 2023 In order to improve the efficiency and accuracy of antenna optimization, an adaptive evolutionary neural network (AENN)-based optimization design method for the wideband dual-polarized antenna is proposed. The proposed AENN is composed of two networks. The ... Full text Cite

Near-unity broadband infrared absorption in a graphene-black phosphorus bimodal triple-layer structure

Journal Article Optical Materials Express · June 1, 2023 It is well known that both graphene and monolayer black phosphorus (BP) can excite and generate surface plasmonic resonances in the infrared spectrum, providing suitable conditions for strong light-matter interactions. To take full advantage of this benefi ... Full text Cite

Coupling Mode Transformation-Based Dielectric Surface and Metasurface for Antenna Decoupler

Journal Article IEEE Transactions on Antennas and Propagation · January 1, 2023 In this communication, a novel hybrid decoupler is proposed to reduce mutual coupling for an extremely compact wideband stacked patch multiple-input-multiple-output (MIMO) array antenna. The hybrid decoupler consists of a dielectric surface and a metasurfa ... Full text Cite

Eigenmode-BLT-Based Method for Calculating the Coupling to Microstrip Antenna Inside a Cavity

Journal Article IEEE Transactions on Antennas and Propagation · May 1, 2022 The electromagnetic (EM) coupling effects of microstrip antennas have become increasingly prominent in complicated electric systems. In this article, a hybrid method is proposed based on the combination of cavity eigenmode theory and BLT equation. First, t ... Full text Cite

A Fan-Shaped Compact Water Antenna With Wide Bandwidth and Optical Transparence

Journal Article IEEE Transactions on Antennas and Propagation · April 1, 2022 A novel wideband and compact water antenna with optically transparent characteristic is presented in this communication. This antenna mainly consists of a fan-shaped cylindrical radiator, a top disk, a cylindrical base, and a water reflector. Based on two ... Full text Cite

Compact matrix-exponential-based fdtd with second-order pml and direct z-transform for modeling complex subsurface sensing and imaging problems

Journal Article Remote Sensing · January 1, 2021 To simulate complex subsurface sensing and imaging problems with both propagating and evanescent waves by the finite-difference time-domain (FDTD) method, the highly-accurate second-order perfectly matched layer (SO-PML) formulations based on the direct Z- ... Full text Cite

Reply to Comments on 'Direct-Splitting-Based CN-FDTD for Modeling 2D Material Nanostructure Problems'

Journal Article IEEE Open Journal of Antennas and Propagation · January 1, 2021 In this response letter, we focus on addressing Yu Hang Yang's comments so that the correctness and validity of the proposed auxiliary-differential-equation-based (ADE) Crank-Nicolson finite-difference time-domain method with direct-splitting technique (CN ... Full text Cite

Semisupervised Radial Basis Function Neural Network with an Effective Sampling Strategy

Journal Article IEEE Transactions on Microwave Theory and Techniques · April 1, 2020 To alleviate the nonuniform error distribution and slow convergence caused by the uncertainty of sample selection in the training process of artificial neural networks, a semisupervised radial basis function neural network (SS-RBFNN) model with a new sampl ... Full text Cite

Investigation of multi-resonant and anisotropic plasmonic resonances in the stacked graphene-black phosphorus bilayers

Journal Article Journal of Physics D: Applied Physics · January 1, 2020 We theoretically investigate the anisotropic plasmonic resonances in the proposed infrared absorber, which consists of stacked graphene-black phosphorus (BP) bilayers with dual absorption peaks. By combining the advantages of graphene and BP, stacked graph ... Full text Cite

Switchable Truncations between the 1st-and 2nd-Order DZT-CFS-UPMLs for Relevant FDTD Problems

Journal Article IEEE Transactions on Antennas and Propagation · January 1, 2020 Adopting the direct Z-transform (DZT) method due to its higher accuracy instead of the approximate Z-transform (AZT) methods and efficient and switchable truncations between the 1st-and 2nd-order uniaxial perfectly matched layers (UPMLs) with the complex-f ... Full text Cite

Direct-Splitting-Based CN-FDTD for Modeling 2D Material Nanostructure Problems

Journal Article IEEE Open Journal of Antennas and Propagation · January 1, 2020 Incorporating a truncation of the complex-frequency-shifted perfectly matched layer (CFS-PML), the direct-splitting-based Crank-Nicolson finite-difference time-domain (CNDS-FDTD) is developed and applied to the infrared two-dimensional layered material (2D ... Full text Cite

Tunable and Anisotropic Dual-Band Metamaterial Absorber Using Elliptical Graphene-Black Phosphorus Pairs.

Journal Article Nanoscale research letters · November 2019 We numerically propose a dual-band absorber in the infrared region based on periodic elliptical graphene-black phosphorus (BP) pairs. The proposed absorber exhibits near-unity anisotropic absorption for both resonances due to the combination of graphene an ... Full text Cite

System-Combined ADI-FDTD Method and Its Electromagnetic Applications in Microwave Circuits and Antennas

Journal Article IEEE Transactions on Microwave Theory and Techniques · August 1, 2019 A system-combined alternating-direction-implicit finite-difference time-domain (SC-ADI-FDTD) is fully presented and well corroborated for 3-D electromagnetic applications. Spatial differential operators of Maxwell's equations can be expressed as two matric ... Full text Cite

Stacked Thin Film Heterostructure with Tunable Ferroelectric BSTO

Conference 2019 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference, CSQRWC 2019 - Proceedings · July 1, 2019 Feasibility study of low profile multilayer patch antennas using stacked BSTO-YIG thin film heterostructure has been investigated. This stacked heterostructure is comprised of an electrical-field-tunable ferroelectric BSTO with two embedded platinum electr ... Full text Cite

Multigrade Artificial Neural Network for the Design of Finite Periodic Arrays

Journal Article IEEE Transactions on Antennas and Propagation · May 1, 2019 To solve the restriction of prior knowledge in artificial neural networks (ANNs) for the modeling of finite periodic arrays, a new multigrade ANN model is proposed in this paper. Considering mutual coupling and array environment, the proposed model is desi ... Full text Cite

Parametric Modeling of Microwave Components Based on Semi-Supervised Learning

Journal Article IEEE Access · January 1, 2019 In the artificial neural network (ANN), the most time-consuming part for parametric modeling of microwave components is the collection of training datasets from full-wave electromagnetic simulations. However, the reported models for parametric modeling of ... Full text Cite

Novel end-fire dipole array antenna with gain and bandwidth enhancement

Journal Article Microwave and Optical Technology Letters · November 1, 2018 A gain and bandwidth enhanced end-fire dipole array antenna is presented. In order to improve the bandwidth of the original dipole array antenna, 2 parasitic metallic strips are closely placed at the end-fire direction. Three pairs of I-shaped resonators w ... Full text Cite

An Accurate 3-D CFS-PML Based Crank-Nicolson FDTD Method and Its Applications in Low-Frequency Subsurface Sensing

Journal Article IEEE Transactions on Antennas and Propagation · June 1, 2018 An unsplit-field and accurate Crank-Nicolson cycle-sweep-uniform finite-difference time-domain (CNCSU-FDTD) method based on the complex-frequency-shifted perfectly matched layer (CFS-PML) is proposed. It is applied to 3-D low-frequency subsurface electroma ... Full text Cite

A novel dual-polarized antenna with low profile and high port isolation

Conference 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings · October 18, 2017 A novel dual-polarized antenna with low profile and high port isolation is proposed in this paper. The proposed antenna consists of two dipoles perpendicular with each other. One dipole is composed of a pair of trapezoidal patches with four triangular para ... Full text Cite

A novel narrowband filter with cross-coupling used for system-in-package applications

Conference 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings · October 18, 2017 A novel narrowband filter with cross-coupling is presented. By taking advantage of the structure of multilayered substrates, two substrate integrated circular cavities (SICCs) are stacked, and cross-coupling is realized between the two resonators by differ ... Full text Cite

Miniaturized quad-band bandstop filter with controllable frequencies using multiple-mode resonator

Conference 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings · October 18, 2017 The operating mechanism of the quad-band band stop filter (QB-BSF) with multiple-mode resonator (MMR) is introduced in this paper. Based on the design procedure, the operating stopband frequency locations of the proposed QB-BSF can be conveniently controll ... Full text Cite

A novel passive feeding network for isolation enhancement of dual-polarized antenna

Conference 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings · October 18, 2017 A novel passive feeding network is proposed to achieve isolation enhancement for the dual-polarized antenna in this paper. The proposed feeding network is composed of two 50 ohm transmission lines, a rectangular loop with an open-ended and another two shor ... Full text Cite

Design of Novel Broadband Endfire Dipole Array Antennas

Journal Article IEEE Antennas and Wireless Propagation Letters · September 16, 2017 A novel broadband endfire dipole array antenna is presented in this letter. With a novel impedance matching method, this antenna is realized as a series-fed structure and four dipole elements on the same printed circuit board. The bandwidth of the antenna ... Full text Cite

Ultra-wideband bandpass filter

Journal Article Microwave Journal · September 1, 2017 A bandpass filter (BPF) design using double-sided edge-coupled microstrip lines and stepped impedance stubs features intrinsic transmission poles, beneficial for achieving an ultrawide bandwidth. When shunted with stubs of different length ratios, multiple ... Cite

Miniaturized Frequency Controllable Band-Stop Filter Using Coupled-Line Stub-Loaded Shorted SIR for Tri-Band Application

Journal Article IEEE Microwave and Wireless Components Letters · July 1, 2017 Based on the coupled-line stub-loaded shorted stepped-impedance resonator (CLSLSSIR), a compact microstrip tri-band band-stop filter (TB-BSF) with controllable frequencies, stopband attenuations (SAs), and sharp transition band roll-off skirts has been pre ... Full text Cite

Dual-band capacitively loaded annular-ring slot antenna for dual-sense circular polarization

Journal Article Journal of Electromagnetic Waves and Applications · June 13, 2017 This paper investigates a simplified and new capacitively loaded annular-ring slot antenna (ARSA) for dual-band and dual-sense circular polarization. The antenna is comprised of two concentric annular-ring slots coupled to a microstrip feed line to achieve ... Full text Cite

Dual-polarized metamaterial cavity-backed antennas for mutual coupling reduction

Journal Article Journal of Electromagnetic Waves and Applications · June 13, 2017 A novel metamaterial cavity for mutual coupling reduction of two closely positioned dual-polarized antennas is proposed in this paper. The metamaterial cavity is composed of four sets of meta-surfaces. Two sets are composed of double-layer complementary fr ... Full text Cite

Metamaterial cavity for the isolation enhancement of closely positioned dual-polarized relay antenna arrays

Journal Article Microwave and Optical Technology Letters · April 1, 2017 A novel metamaterial cavity for the isolation enhancement of closely positioned dual-polarized relay antenna arrays is proposed in this paper. The metamaterial cavity is composed of four sets of double-layer complementary meta-surface and metal reflector. ... Full text Cite

Microstrip-line-fed reactively loaded circularly polarized annular-ring slot antenna

Journal Article Journal of Electromagnetic Waves and Applications · January 2, 2017 A simple and novel reactively loaded annular-ring slot antenna (ARSA) fed by a microstrip line is proposed and investigated for circularly polarized (CP) radiation. An appropriate reactive component, i.e. lumped capacitor/inductor, is introduced across the ... Full text Cite

A compact wide bandpass filter with good selectively

Journal Article Progress In Electromagnetics Research C · January 1, 2017 A compact Ku-band bandpass filter (BPF) with wide passband, compact size and high selectively is presented. The presented BPF is composed of two quarter-wavelength resonators and a dual-mode resonator, resulting in a compact circuit size. The transmission ... Full text Cite

Miniaturized Quad-band Bandstop Filter with Controllable Frequencies Using Multiple-Mode Resonator

Conference 2017 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING · January 1, 2017 Link to item Cite

A Novel Narrowband Filter with Cross-coupling Used for System-in-Package Applications

Conference 2017 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING · January 1, 2017 Link to item Cite

A miniaturized circularly polarized microstrip antenna with bandwidth enhancement

Conference 2016 IEEE Antennas and Propagation Society International Symposium, APSURSI 2016 - Proceedings · October 25, 2016 A miniaturized single-feed cross-aperture coupled right-handed circularly polarized (RHCP) microstrip antenna with bandwidth enhancement has been presented. The antenna size miniaturization is achieved by the capacitive loading offered by the shorting stri ... Full text Cite

Novel design of end-fire dipole array antennas

Conference 2016 IEEE Antennas and Propagation Society International Symposium, APSURSI 2016 - Proceedings · October 25, 2016 An end-fire dipole array antenna with a novel impedance matching feeding structure is presented for point-to-point communication or power transmission. The widths of the transmission lines are adjusted to match the radiation conductance of the adjacent dip ... Full text Cite

Miniaturised X-band balanced microwave limiter based on thin film hybrid integrated circuit technology

Journal Article Electronics Letters · July 21, 2016 On the basis of thin film hybrid integrated circuit technology, a miniaturised X-band balanced microwave limiter with low insertion loss (IL), low spike and flat leakage power and short recovery time has been presented. The balanced circuit configuration i ... Full text Cite

Design of LPF using suspended substrate microstrip lines as high-Z sections for stopband extension

Journal Article Microwave and Optical Technology Letters · May 1, 2016 This article introduces the use of suspended substrate microstrip lines (SSMLs) as high-Z sections in the design of lowpass filters (LPFs) to extend the stopband. The SSMLs are formed by etching slots on the backside of microstrip lines and placing the sub ... Full text Cite

Compact sext-band bandpass filter based on single multimode resonator with high band-to-band isolations

Journal Article Electronics Letters · April 28, 2016 On the basis of a single multimode resonator (MMR), a miniaturised microstrip sext-band bandpass filter (BPF) with high band-to-band isolations has been presented. The proposed MMR is an stepped impedance resonator (SIR) with one short-circuited stub loade ... Full text Cite

Taming the ghost within: An approach toward addressing apparent electronic poltergeist activity

Journal Article Journal of Parapsychology · March 1, 2016 A report of electrical disturbances in a family home prompted a physician to contact the Rhine Research Center to explore a potential case of RSPK. This investigation provided much anecdotal and some strong evidence for an electronic poltergeist disturbanc ... Cite

Miniaturized single-feed cross-aperture coupled circularly polarized microstrip patch antenna

Journal Article Progress In Electromagnetics Research C · January 1, 2016 A novel miniaturized single-feed cross-aperture coupled circularly polarized (CP) microstrip patch antenna loaded by four identical shorting strips is proposed and discussed. Each shorting strip underneath the edges of the radiating patch is connected to t ... Full text Cite

A compact stub-loaded composite right/left-handed resonator and its application in bandpass filters

Journal Article Microwave and Optical Technology Letters · September 1, 2015 A new compact stub-loaded composite right/left-handed (SL-CRLH) resonator is presented for the first time. The resonance properties of the proposed SL-CRLH resonator are deduced by odd- and even-mode analysis method. Besides miniaturization and wide upper ... Full text Cite

Microstrip dual-mode bandpass filter design using pie-section truncated semi-circle and quarter-circle resonators

Journal Article IET Microwaves, Antennas and Propagation · February 19, 2015 New dual-mode microstrip bandpass filters (BPFs) using pie-section truncated semi-circle and/or quarter-circle resonators are presented. The even-mode and odd-mode frequency responses of these two resonators are investigated. Compared to the four-parameter ... Full text Cite

Design of a stub-loaded ring-resonator slot for antenna applications

Journal Article IEEE Transactions on Antennas and Propagation · February 1, 2015 A T-shaped stub-loaded ring-resonator (SLRR) slot etched on the ground plane or on the radiating patch has been designed and analyzed for antenna applications. Compared with the conventional ring slot, the two resonant frequencies of the proposed SLRR-slot ... Full text Cite

Compact planar antenna for triple frequency band operation

Conference IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · September 18, 2014 A novel triple band planar antenna using a four-stub-loaded ring-slot on the ground and a U-slot on the microstrip-fed line is presented. The ring slot is designed to drive two different resonant modes, and the four T-shaped stubs are loaded to lower these ... Full text Cite

Planar interdigital-coupled UWB bandpass filter with a notched band

Conference IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · September 18, 2014 This paper presents a planar compact microstrip interdigital-coupled notch-band ultra-wideband (UWB) bandpass filter (BPF). The proposed five high-impedance interdigital lines are employed to not only realize strong coupling as feed lines, but also create ... Full text Cite

Planar dual- and tri-band bandpass filters using single improved ring resonator and simple feed scheme

Journal Article Microwave and Optical Technology Letters · March 1, 2014 A planar single improved dual-mode ring resonator loaded by four mushroom-shaped stubs based on a simple feed scheme is presented for design of dual- and tri-band bandpass filters (BPFs). The simple pair of feed lines with source-load coupling is used to n ... Full text Cite

Two memristor SPICE models and their applications in microwave devices

Journal Article IEEE Transactions on Nanotechnology · January 1, 2014 This paper presents two simple SPICE circuit models of the memristor using two different kinds of integrators. These models expand and simplify the previous methods of solving the memristor's modeling equations presented by Hewlett-Packard Lab. The behavio ... Full text Cite

Compact ultra-wideband bandpass filter using quad-T-stub-loaded ring structure

Journal Article Microwave and Optical Technology Letters · January 1, 2014 A compact ultrawideband (UWB) planar bandpass filter (BPF) using quad-T-stub-loaded ring resonator is presented. At this filter, two sets of the four high impedance lines at the two sides of the ring as the coupling fed structure are used to gain much stro ... Full text Cite

Miniaturized notch-band UWB bandpass filters using interdigital-coupled feed-line structure

Journal Article Microwave and Optical Technology Letters · January 1, 2014 Two ultrawideband (UWB) bandpass filters (BPFs) using interdigital-coupled feed-line structures with different notched frequency bands are presented. The proposed interdigital lines are used, not only to realize strong coupling as feed lines, but also be a ... Full text Cite

Patch antenna with electrically tunable ferrite-ferroelectric bilayer

Conference Progress in Electromagnetics Research Symposium · January 1, 2014 A coaxial-fed patch antenna with a ferrite-ferroelectric bilayer above a regular alumina substrate has been designed and analyzed. The ferrite-ferroelectric bilayer, multiferroic heterostructure, consists of a near-single-crystal ferrite yttrium iron garne ... Cite

SPICE model of memristor and its application

Journal Article Midwest Symposium on Circuits and Systems · December 1, 2013 In this paper, a circuit model of the memristor using SPICE is presented, which expands the hitherto methods to solve the memristor's modeling equations presented by HP lab. This kind of the memristor model can not only be encoded in SPICE and satisfy the ... Full text Cite

Microstrip multi-band bandpass filters using a single improved ring resonator

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · December 1, 2013 A planar dual-mode ring resonator loaded by four mushroom-shaped stubs is presented for design of dual-band bandpass filter (BPF). The four mushroom-shaped stubs utilized in the inner area of the traditional dual-mode ring resonator can realize both compac ... Full text Cite

Magnetic antenna based on two dimensional DC superconducting quantum interference filter

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · December 1, 2013 We first theoretically present a magnetic antenna based on a two dimensional DC superconducting quantum filter device. This antenna may detect the dynamical magnetic field instead of the absolute magnetic field. We call it B-antenna since it only responses ... Full text Cite

Tr-Band Bandpass Filter Using Shorted Stub-Loaded Dual-Mode Resonators

Journal Article MICROWAVE JOURNAL · September 1, 2013 Link to item Cite

Tri-band bandpass filter using shorted stub-loaded dual-mode resonators

Journal Article Microwave Journal · September 1, 2013 A compact tri-band bandpass filter (BPF) using three shorted stub-loaded dual-mode resonators (SSLDMR) is presented. To verify the approach, three single-band filters with only one folded SSLDMR and the same pair of meandering feed lines are each simulated ... Cite

Nano-scale memristor SPICE implementation using ideal operational amplifier model

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · January 1, 2013 The conception of memristor is becoming increasingly prevalent due to its remarkable electronic properties. In this paper, a circuit model of the memristor using simple SPICE code is presented. An ideal closed-loop operational amplifier (OP-AMP) is applied ... Full text Cite

RSPK and consciousness

Journal Article Journal of Parapsychology · January 1, 2013 We review some important RSPK cases and discuss physical theoretical concepts that may account for the phenomena. A major problem for the RSPK researcher has been to identify the energy that causes object movements. As a first step in understanding RSPK, P ... Cite

A tri-mode bandpass filter using capacitive and inductive source-load coupling

Journal Article Microwave Journal · 2013 This article presents a compact microstrip bandpass filter (BPF), which consists of a circular tri-mode resonator (CTMR) and two meandering feed lines with both capacitive and inductive S-L couplings to obtain good harmonic suppression and multiple transmi ... Cite

Novel design of a compact triple-band bandpass filter using short stub-loaded sirs and embedded sirs structure

Journal Article Progress in Electromagnetics Research · January 1, 2013 A novel compact planar triple-band bandpass filter using two sets of short stub-loaded stepped impedance resonators (SSLSIRs) and a pair of embedded stepped impedance resonators (ESIRs) has been proposed. The SSLSIRs can adjust the bandwidths of the corres ... Full text Cite

Novel circular dual-mode filter with both capacitive and inductive source-load coupling for multiple transmission zeros

Journal Article Journal of Electromagnetic Waves and Applications · December 1, 2012 In this paper, a novel miniaturized bandpass filter (BPF) using a circular dual-mode resonator with both capacitive source-load (S-L) coupling and inductive S-L coupling is presented for the first time. The proposed filter consists of a circular open stub- ... Full text Cite

A tri-mode bandpass filter based on both capacitive and inductive source-load coupling

Journal Article Microwave Journal · November 2012 Cite

Characterization of meander dipole antennas with a geometry-based, frequency-independent lumped element model

Journal Article IEEE Antennas and Wireless Propagation Letters · 2012 Meander antennas have gained widespread use in applications such as radio frequency identification (RFID) devices where space for the antenna is limited or a low-frequency operation is required. Several size-reduction and synthesis methods have been propos ... Full text Cite

Effects of meandering on dipole antenna resonant frequency

Journal Article IEEE Antennas and Wireless Propagation Letters · 2012 In low-frequency applications, antenna designers find that it is beneficial to adjust the resonant frequency while preferably maintaining the physical size as a means of improving the antenna's radiation resistance, which in turn improves the radiation eff ... Full text Cite

Electromagnetic emission from humans during focused intent

Journal Article Journal of Parapsychology · 2012 The Bioenergy Laboratory at the Rhine Research Center detects electromagnetic radiation from humans during times of focused intent-typically during deep meditation or implied energetic healing activities. Sensitive infrared (IR) and ultraviolet (UV) light ... Cite

Directly-Driven Antennas from a Circuit Analysis Viewpoint

Journal Article Proceedings of the 2011 Antenna Applications Symposium · 2011 Cite

Improved hyperthermia treatment control using SAR/temperature simulation and PRFS magnetic resonance thermal imaging.

Journal Article Int J Hyperthermia · 2011 PURPOSE: This article explores the feasibility of using coupled electromagnetic and thermodynamic simulations to improve planning and control of hyperthermia treatments for cancer. The study investigates the usefulness of preplanning to improve heat locali ... Full text Link to item Cite

Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2011 A wide frequency bandwidth and high power efficiency are important goals of radio transmitter design. Conventional radio transmitters have a narrow bandwidth, primarily limited by the bandwidth of the impedance matching network between the power amplifier ... Full text Cite

Broadband electromagnetic radiation modulated by dual memristors

Journal Article IEEE Antennas and Wireless Propagation Letters · 2011 Using dual high-speed memristors, we report on an efficient broadband electromagnetic radiation from a narrowband microstrip patch antenna. The directly modulated microstrip patch antenna system with dual memristors is calculated by using an integrated ful ... Full text Cite

Electromagnetic modeling and simulation of a directly modulated patch antenna

Journal Article IEEE Antennas and Wireless Propagation Letters · August 24, 2010 The direct modulation of an L-band microstrip patch antenna with integrated fast-switching p-i-n diodes is explored over a range of modulation frequencies well beyond the resonant bandwidth of the antenna. Electromagnetic simulation of one embodiment of a ... Full text Cite

Digitally driven antenna for HF transmission

Journal Article IEEE Transactions on Microwave Theory and Techniques · 2010 An electrically small antenna connected directly to a complementary pair of switching transistors is driven with a pulsewidth modulated HF signal, eliminating the requirement for a frequency-dependent impedance-matching network. The intrinsic reactance of ... Full text Cite

Microwave imaging in layered media: 3-D image reconstruction from experimental data

Journal Article IEEE Transactions on Antennas and Propagation · 2010 A prototype microwave imaging system for imaging 3-D targets in layered media is developed to validate the capability of microwave imaging with experimental data and with 3-D nonlinear inverse scattering algorithms. In this experimental prototype, the tran ... Full text Cite

Switched antenna circuit with increased information bandwidth

Journal Article IEEE Antennas and Wireless Propagation Letters · 2010 An L-band microstrip patch antenna is directly modulated with fast-switching p-i-n diodes over a range of modulation frequencies well beyond the resonant bandwidth of the antenna. The experimental results, in both the time and frequency domains, show that ... Full text Cite

The performance of a reduced-order adaptive controller when used in multi-antenna hyperthermia treatments with nonlinear temperature-dependent perfusion.

Journal Article Phys Med Biol · April 7, 2009 In large multi-antenna systems, adaptive controllers can aid in steering the heat focus toward the tumor. However, the large number of sources can greatly increase the steering time. Additionally, controller performance can be degraded due to changes in ti ... Full text Link to item Cite

Clinical Utility of Magnetic Resonance Thermal Imaging (MRTI) For Realtime Guidance of Deep Hyperthermia.

Journal Article Proc SPIE Int Soc Opt Eng · February 25, 2009 A critical need has emerged for volumetric thermometry to visualize 3D temperature distributions in real time during deep hyperthermia treatments used as an adjuvant to radiation or chemotherapy for cancer. For the current effort, magnetic resonance therma ... Full text Link to item Cite

Control time reduction using virtual source projection for treating a leg sarcoma with nonlinear perfusion.

Journal Article Proc SPIE Int Soc Opt Eng · February 12, 2009 PURPOSE: Blood perfusion is a well-known factor that complicates accurate control of heating during hyperthermia treatments of cancer. Since blood perfusion varies as a function of time, temperature and location, determination of appropriate power depositi ... Full text Link to item Cite

A tapered microstrip patch antenna array for use in breast cancer screening via 3D active microwave imaging

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2009 Full text Cite

Multisection bandpass filters using capacitively loaded transmission lines

Journal Article Microwave and Optical Technology Letters · 2009 In the frequency range from 50 to 500 MHz, lumped element inductors may have internal resonances, and the distributed nature of the physical structure is solved using transmission-line theory. Stub filters (shorted or opened stubs separated by sections of ... Full text Cite

SU‐GG‐T‐366: Hyperthermia Treatment for a Patient with Two Shank Sarcomas Treated by a Fast Pre‐Treatment Optimization Method

Conference Medical Physics · January 1, 2008 Purpose: Cancerous cells are infiltrative and can invade neighborhood and/or distant body. While hyperthermia shows promising synergistic effects being used with radiation and/or chemotherapy, current microwave/radiofrequency power focusing techniques only ... Full text Cite

Active microwave imaging II: 3-D system prototype and image reconstruction from experimental data

Journal Article IEEE Transactions on Microwave Theory and Techniques · 2008 A 3-D microwave imaging system prototype and an inverse scattering algorithm are developed to demonstrate the feasibility of 3-D microwave imaging for medical applications such as breast cancer detection with measured data. In this experimental prototype, ... Full text Cite

Towards the validation of a commercial hyperthermia treatment planning system

Journal Article Microwave Journal · 2008 Recent collaborative study at Duke University to demonstrate the capabilities of new suite of 3D electromagnetic and thermodynamic simulation tools for treatment planning of external hypothermia treatments with Radio Frequency (RF) phased-array heat applic ... Cite

3D EIT for breast cancer imaging: System, measurements, and reconstruction

Journal Article Microwave and Optical Technology Letters · 2008 Electrical impedance tomography (EIT) is a developing imaging modality for early detection of breast cancer. In an EIT system, a low-frequency current is applied sequentially between different electrode pairs while voltage measurements are made at other el ... Full text Cite

Metal waveguides with uniform electric field distributions

Journal Article 2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI · 2008 Full text Cite

A Tapered Microstrip Patch Antenna Array for Microwave Breast Imaging

Conference 2008 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-4 · January 1, 2008 Link to item Cite

2D EIT for biomedical imaging: Design, measurement, simulation, and image reconstruction

Journal Article Microwave and Optical Technology Letters · 2007 A 2D electrical impedance tomography (EIT) system has been developed at Duke University as an experimental system to test the forward and inverse algorithms for EIT application. The forward model is based on the 2nd-order finite element method (FEM), while ... Full text Cite

Electromagnetic modeling and simulation of a directly-modulated L-band microstrip patch antenna

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2007 Full text Cite

Experimental and numerical investigations of a high-resolution 3D microwave imaging system for breast cancer detection

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2007 Full text Cite

Experimental and numerical investigations of a high-resolution 3D microwave imaging system for breast cancer detection

Conference 2007 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-12 · January 1, 2007 Link to item Cite

Electromagnetic modeling and simulation of a directly-modulated l-band microstrip patch antenna

Conference 2007 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-12 · January 1, 2007 Link to item Cite

Double-sided exponentially tapered GPR antenna and its transmission line feed structure

Journal Article IEEE Transactions on Antennas and Propagation · 2006 A double-sided broadband antenna for applications including ground-penetrating radar for detecting buried target is described. When compared with traditional coplanar-strip antennas, a better performance is achieved with a more practical design for constru ... Full text Cite

Direct antenna modulation: Analysis, design, and experiment

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2006 Full text Cite

A 3D EIT system for breast cancer imaging

Journal Article 2006 3rd IEEE International Symposium on Biomedical Imaging: From Nano to Macro - Proceedings · 2006 Electrical impedance tomography (EIT) is a developing and promising imaging modality for early detection of breast cancer. An EIT system utilizes an array of electrodes to apply currents to an imaging domain and measures the resulting voltages on the perip ... Cite

Electromagnetic time-reversal imaging of a target in a cluttered environment

Journal Article IEEE Transactions on Antennas and Propagation · 2005 Electromagnetic time-reversal imaging is addressed for a target situated in a cluttered background. We first investigate the theory of electromagnetic time-reversal imaging, followed by an experimental demonstration. A transmitter-receiver antenna array is ... Full text Cite

Analysis, design, and construction of a broadband balun for coaxial-to-planar transmission lines

Journal Article Microwave and Optical Technology Letters · 2005 For microwave signals within the 0.5 to 10.5 GHz range, we present an integrated broadband balun that carries signals from co-axial cable to microstrip to parallel-plate line. We use this arrangement as the feed line for a broadband double-sided antenna, a ... Full text Cite

Design and analysis of annular antenna arrays with different reflectors.

Journal Article Int J Hyperthermia · September 2004 The design and performance of annular antenna arrays with reflectors is presented. Arrays with three shapes of reflectors are analysed and simulated. These include the corner reflector, the circular reflector and the elliptical reflector. Power-density dis ... Full text Link to item Cite

Comparison of coaxial dipole antennas for applications in the near-field and far-field regions

Journal Article Microwave Journal · 2004 Coaxial antennas with properties similar to those of a two-wire dipole antenna are presented and analyzed. Since coaxial antennas extend along a straight line and can have almost any radius, they may be easily inserted into confined spaces that require an ... Cite

Bandwidth analysis in the curved WDM waveguide coupler

Journal Article Microwave and Optical Technology Letters · 2004 The curved WDM waveguide coupler is presented and analyzed in this paper. Compared with the traditional straight coupler, the curved coupler has the advantage of achieving a wider bandwidth. Waveguide theory and the beam propagation method (BPM) are employ ... Cite

Time-domain target detection using a double-sided broadband antenna

Journal Article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2004 The application of a double-sided broadband antenna for time-domain target detection was discussed. A mathematical model to simulate the structure and performance of the antenna was established, based on dipole antenna array theory. A formula for the elect ... Cite

Microwave breast imaging: 3-D forward scattering simulation.

Journal Article IEEE Trans Biomed Eng · October 2003 Active microwave imaging (MWI) is emerging as a promising technique for the detection of biomedical anomalies such as breast cancer because of the high electrical contrasts between malignant tumors and normal tissue. Previously, we have developed fast two- ... Full text Link to item Cite

A linear approximation of the coupling coefficient in the WDM coupler

Journal Article Microwave and Optical Technology Letters · 2003 A linear approximation of the coupling coefficient for the wavelength division multiplexing (WDM) coupler is presented. Our aim is to better understand and to simplify the design of couplers used in optical communications. The theoretical calculation and t ... Full text Cite

Enhanced WDM performance using curved waveguide couplers

Journal Article Optics Communications · 2003 This paper presents a wavelength division multiplexing (WDM) waveguide coupler that is composed of a pair of curved circular waveguides, where changing the radius of curvature and the spacing between the two waveguides controls the coupler operation. Based ... Full text Cite

Active microwave imaging I - 2-D forward and inverse scattering methods

Journal Article IEEE Transactions on Microwave Theory and Techniques · 2002 Active microwave imaging (MWI) for the detection of breast tumors is an emerging technique to complement existing X-ray mammography. The potential advantages of MWI arise mainly from the high contrast of electrical properties between tumors and normal brea ... Full text Cite

RSPK and consciousness

Conference JOURNAL OF PARAPSYCHOLOGY · December 1, 2001 Link to item Cite

Variations of focal regions versus numbers and positions of sources in two-dimensional media.

Journal Article Int J Hyperthermia · 2001 This paper explores the behaviour of the primary and secondary hot spots in homogeneous and two-dimensional inhomogeneous medium. Circular arrays are considered with a radius of up to five wavelengths. The number of sources and their positions in the array ... Full text Link to item Cite

Genetic design of linear antenna arrays

Journal Article IEEE Antennas and Propagation Magazine · 2000 Full text Cite

Using parallel resonators to create improved maximally flat quarter-wavelength transformer impedance-matching networks

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1999 This paper presents a general approach for designing maximally flat quarter-wave transformer impedance-matching networks (QWT-IMN's) used in conjunction with parallel resonators. The approach used finds a maximally flat form by setting lower order terms of ... Full text Cite

Comparison of various optimization strategies for Yagi-Uda antenna design

Journal Article Annual Review of Progress in Applied Computational Electromagnetics · 1999 This paper examines several optimization techniques as they are applied to Yagi-Uda antenna design. Most of the techniques discussed are various forms of genetic algorithms (GAs). A gradient method is also used both alone and in conjunction with GAs. Stati ... Cite

Using the binomial transformer to approximate the Q distribution for maximally flat quarter-wavelength-coupled filters

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1998 With the binomial transformer as a basis, a closed-form expression is derived for the Q distribution used to design maximally flat quarter-wavelength-coupled transmission-line filters. The derived expression is shown to be valid for filters with small valu ... Full text Cite

Comparison of the broadband performance of two-way power dividers and combiners

Journal Article Microwave and Optical Technology Letters · 1998 A comparison of the broadband performance of four different microwave power divider/combiner networks is presented. Each network is designed to have a Butterworth (maximally flat magnitude) response versus frequency, and each is limited to approximately th ... Cite

Theory and modeling of bandpass filters in waveguide using thin ferrite layers

Journal Article Microwave and Optical Technology Letters · 1998 This work examines the use of thin ferrite layers to form circuit components in a waveguide. The planar layers are positioned perpendicular to the waveguide axis. A unique lumped-element circuit model for a thin layer is developed, and practical limitation ... Cite

System to maximize the return signal of ground-penetrating radars

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · 1998 We examine a ground-penetrating radar system that uses two antennas with their boresight direction maintained at or near the Brewster angle for the air-soil interface. For signals going to and returning from the buried target, this arrangement minimizes re ... Full text Cite

Designing maximally flat quarter-wavelength-coupled filters using the Q distribution method

Journal Article Microwave Journal · 1997 Four filter design examples are presented using the Q distribution (QD) method 1 to develop maximally flat quarter-wavelength-coupled transmission line filters accurately using arbitrary resonators. This article demonstrates the accuracy of the QD method u ... Cite

Designing maximally flat quarter-wavelength-coupled filters using the Q distribution method

Journal Article Microwave Journal · 1997 Four filter design examples are presented using the Q distribution (QD) method to develop maximally flat quarter-wavelength-coupled transmission line filters accurately using arbitrary resonators. This article demonstrates the accuracy of the QD method usi ... Cite

Design of yagi-uda antennas using genetic algorithms

Journal Article IEEE Transactions on Antennas and Propagation · 1997 A method of using genetic algorithms to optimize the element spacing and lengths of Yagi-Uda antennas is presented. A method of moments code, NEC2, performs the task of evaluating each of the antenna designs generated by the genetic algorithm (GA) during t ... Full text Cite

A capacitively loaded half-wavelength tapped-stub resonator

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1997 This paper examines a new resonator which is created by adding capacitive loading to a half-wavelength tappedstub resonator. This capacitively loaded resonator has the property that both the Q and the resonant frequency can be set independently. This prope ... Full text Cite

Air-gap reluctance and inductance calculations for magnetic circuits using a schwarz-christoffel transformation

Journal Article IEEE Transactions on Power Electronics · 1997 A method for calculating the reluctance of air gaps in magnetic circuits making use of a Schwarz-Christoffel transformation is described. The method is applied to the calculation of the inductance of example configurations and its validity established thro ... Full text Cite

Maximally Flat Quarter-Wavelength-Coupled Transmission-Line Filters Using Q Distribution

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1997 This paper presents a technique for accurately designing maximally flat quarter-wavelength-coupled transmissionline filters using arbitrary resonant elements. The design procedure currently used, which is based on the lumped-element low-pass prototype, yie ... Full text Cite

Dielectric slab-loaded resonant cavity for applications requiring enhanced field uniformity

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1996 This paper introduces and analyzes a rectangular resonant structure that provides an alternative to the multimode resonant cavity in applications requiring enhanced field uniformity. The resonant cavity contains four dielectric loading slabs placed along t ... Full text Cite

Determining Q using S parameter data

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1996 A method is presented for determining frequency selectivity (Q) of a network using scattering (S) parameter data, data that is readily available from network measurements or analysis. The approach is based on a formulation for Q that uses the change in rea ... Cite

Electric field distributions in TEM waveguides versus frequency

Journal Article Journal of Microwave Power and Electromagnetic Energy · 1995 This paper addresses the behavior of a transverse electromagnetic (TEM) waveguide operated at frequencies centered around its intended design frequency. A boundary condition analysis leads to an eigenvalue formulation, which is used to determine closed-for ... Cite

Air-gap reluctance and inductance calculations for magnetic circuits using a Schwarz-Christoffel transformation

Journal Article PESC Record - IEEE Annual Power Electronics Specialists Conference · 1995 A method for calculating the reluctance of air gaps in magnetic circuits making use of a Schwarz-Christoffel transformation is described. The method is applied to the calculation of the inductance of example configurations and its validity established thro ... Cite

The measured electrical properties of normal and malignant human tissues from 50 to 900 MHz.

Journal Article Med Phys · April 1994 The electrical conductivity and relative permittivity of malignant and normal human tissues were measured at frequencies from 50 to 900 MHz. The measurements were made between 23 and 25 degrees C using a network analyzer connected to a flat-ended coaxial p ... Full text Link to item Cite

Measured DC performance of large arrays of silicon field emitters

Journal Article IEEE Transactions on Electron Devices · 1994 Large arrays of silicon field emitters are being produced at MCNC for use in RF and microwave amplifiers and other high-intensity electron beam source applications. Significant levels of both total emitted current (up to 7 mA) and current density (7 A/cm2) ... Full text Cite

Finite element computation of electromagnetic fields

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1994 A three dimensional finite element solution scheme is developed for numerically computing electromagnetically induced power depositions. The solution method is applicable to those problems for which it can be reasonably assumed that the magnetic permeabili ... Full text Cite

Theoretical and measured electric field distributions within an annular phased array: consideration of source antennas.

Journal Article IEEE Trans Biomed Eng · August 1993 The magnitude of E-field patterns generated by an annular array prototype device has been calculated and measured. Two models were used to describe the radiating sources: a simple linear dipole and a stripline antenna model. The stripline model includes de ... Full text Link to item Cite

Modelling aperture antennas in the near- and far-field regions using subarrays of equivalent uniformly illuminated apertures [microwave hyperthermia application]

Journal Article Int. J. Hyperth. (UK) · 1993 Develops and presents an application of Huygen's principle herein referred to as the equivalent uniformly illuminated aperture method (EUAM). This method is used to predict the E-field patterns of aperture antennas in both the near- and far-field regions. ... Cite

Modelling aperture antennas in the near- and far-field regions using subarrays of equivalent uniformly illuminated apertures.

Journal Article Int J Hyperthermia · 1993 This paper develops and presents an application of Huygen's principle herein referred to as the equivalent uniformly illuminated aperture method (EUAM). This method is used to predict the E-field patterns of aperture antennas in both the near- and far-fiel ... Full text Link to item Cite

Inductance of planar structures

Journal Article Conference Procedings - IEEE Applied Power Electronics Conference and Exposition - APEC · 1993 A method for calculating the inductance of planar-spiral structures in the presence, and in the absence, of magnetic core material is presented. In this method, the current is assumed to flow in the exact center of the planar conductor. Simplified expressi ... Cite

On the accuracy of noninvasive thermometry using molecular diffusion magnetic resonance imaging.

Journal Article Int J Hyperthermia · 1992 Temperature measurement using magnetic resonance imaging (MRI) of water self-diffusion is investigated. Diffusion images and derived temperatures are obtained in polyacrylamide gel phantom. The temperatures measured from MRI are compared with those from te ... Full text Link to item Cite

Traveling-wave amplifiers with prescribed frequency response

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1992 Microwave transistor amplifier combinations that have controlled frequency response over a specified bandwidth were designed. Theoretical analysis of such an amplifier with an arbitrary number of sections is presented. The response of the amplifier is cont ... Full text Cite

MICROWAVE BANDPASS-FILTERS USING SERIES-CASCADED SECTIONS OF MICROSTRIP LINE

Journal Article MICROWAVE AND OPTICAL TECHNOLOGY LETTERS · 1992 Full text Cite

Inductance of planar rectangular-spiral strip conductors for low-profile inductors

Conference PESC Record - IEEE Annual Power Electronics Specialists Conference · January 1, 1992 Two methods are presented for calculating the inductance of planar rectangular spirals. The first method assumes current flows only in the exact center of the conductor. The second method is based on uniform current distribution across the conductor width, ... Full text Cite

Immunomagnetic purging of breast cancer from bone marrow for autologous transplantation.

Journal Article Bone Marrow Transplant · February 1991 Intensive chemotherapy with autologous bone marrow transplantation is a promising approach for the treatment of breast cancer, provided that clonogenic tumor cells do not contaminate the patient's bone marrow. We have previously demonstrated that a combina ... Link to item Cite

Prediction of heating patterns of a microwave interstitial antenna array at various insertion depths.

Journal Article Int J Hyperthermia · 1991 Measurements made on the interstitial microwave antennas used for hyperthermia cancer therapy indicate that the heating patterns vary with the insertion depths (defined as the distance from the antenna tip to air-tissue interface). The antennas are made of ... Full text Link to item Cite

Heating patterns generated by phase modulation of a hexagonal array of interstitial antennas.

Journal Article IEEE Trans Biomed Eng · January 1991 In this paper, we investigate an array of six interstitial microwave antennas used for hyperthermia cancer treatment. The purpose is to generate both uniform and controlled nonuniform heating patterns in biological tissue by phase modulating the signals ap ... Full text Link to item Cite

Phantom evaluation of temperature measurements using MR molecular diffusion technique

Journal Article Proceedings of the Annual Conference on Engineering in Medicine and Biology · 1991 Temperature measurements using magnetic resonance imaging of molecular diffusion are evaluated. Diffusion images and derived temperatures are obtained with gel-phantom. The temperatures measured from MRI are compared with those from probes to verify their ... Cite

Microwave hyperthermia induced by a phased interstitial antenna array

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1990 An interstitial microwave antenna array for hyperthermia cancer treatment is investigated. The purpose is to generate both uniform and controlled nonuniform temperature distributions in biological tissue by modulating the phases of the signals applied to e ... Full text Cite

Calculated and measured temperature distribution of a phased interstitial antenna array

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1990 The power deposition pattern of four antennas, positioned on the corners of a 2-cm square array with different driving phases, is computed under the assumption of negligible coupling between the antennas. The spatial SAR (specific absorption rate) distribu ... Full text Cite

Immunopharmacologic purging of breast cancer from bone marrow for autologous bone marrow transplantation.

Journal Article Prog Clin Biol Res · 1990 Link to item Cite

Multiple power-density windows and their possible origin.

Journal Article Bioelectromagnetics · 1989 We have previously reported that in vitro exposure of chick forebrain tissue to 50-MHz radiofrequency (RF) electromagnetic radiation, amplitude modulated (AM) at 16 Hz, would enhance the efflux of calcium ions within only two power-density ranges: one from ... Full text Link to item Cite

A comparison using tissue electrical properties and temperature rise to determine relative absorption of microwave power in malignant tissue.

Journal Article Med Phys · 1989 This paper compares two methods for determining the radio frequency absorbed power in tissue: from the measured electrical properties of the tissue, and from the induced temperature rise per unit time. In previous research, we measured the ratio frequency ... Full text Link to item Cite

Lack of effects from 2000-Hz magnetic fields on mammary adenocarcinoma and reproductive hormones in rats

Journal Article Bioelectromagnetics · 1989 Cite

Effect of ambient levels of power-line-frequency electric fields on a developing vertebrate.

Journal Article Bioelectromagnetics · 1988 Fertilized eggs of Gallus domesticus were exposed continuously during their 21-day incubation period to either 50- or 60-Hz sinusoidal electric fields at an average intensity of 10 Vrms/m. The exposure apparatus was housed in an environmental room maintain ... Full text Link to item Cite

Determination of the electromagnetic field and SAR pattern of an interstitial applicator in a dissipative dielectric medium.

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1988 The spatial distribution of microwave energy absorbed per unit mass (the specific absorption rate or SAR) in biological tissue is calculated for a class of interstitial antennas. The insulated interstitial applicator is simulated as an asymmetrically drive ... Full text Cite

Electromagnetic fields induced in a person due to devices radiating in the 10 Hz to 100 KHz range

Journal Article IEEE Transactions on Electromagnetic Compatibility · 1988 Using dipole and image theory with prolate spheroid models, a qualitative evaluation is made of the electric and magnetic fields induced at selected points inside a person due to external electric and magnetic fields within the 10-Hz-100-kHz range. The aut ... Full text Cite

Feasibility study of batteryless temperature transponders using miniature microwave cavity resonators.

Journal Article IEEE Trans Biomed Eng · September 1987 Full text Link to item Cite

ATTENUATION AND POWER-HANDLING CAPABILITY OF T-SEPTUM WAVE-GUIDES

Journal Article IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES · September 1, 1987 Link to item Cite

Characteristics of transverse electric and magnetic field transmission cells at extremely low frequencies [health effects research application]

Journal Article Bioelectromagnetics (USA) · 1987 Transverse electric and magnetic field (TEM) cells are often designed to subject samples to electromagnetic radiation of intrinsic impedance (E/H) that is the same as in free space, 377 Ω. Earlier work has shown this value to be correct for the RF re ... Cite

METHOD FOR CALCULATING ELECTRIC AND MAGNETIC FIELDS IN TEM CELLS AT ELF.

Journal Article IEEE Transactions on Electromagnetic Compatibility · 1987 A method is presented whereby the electric and magnetic field distributions within rectangular-strip transmission lines (TEM cells) can be calculated. Quasistatic approximations are utilized, thus restricting the validity of the results to operational freq ... Cite

Experimental method for the hyperthermic treatment of cells in tissue culture: initial application to pancreatic cancer cells.

Journal Article Bioelectromagnetics · 1987 Hyperthermia is attractive as a potential adjunctive modality in the treatment of cancer, especially those cancers that are more resistant to conventional modalities. In the present study, we characterized the response of two pancreatic cancer cell lines t ... Full text Link to item Cite

ATTENUATION AND POWER-HANDLING CAPABILITY OF T-SEPTUM WAVEGUIDES.

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1987 The attenuation characteristics and power-handling capabilities of single T-septum waveguides are presented. The analysis is based on numerical solutions using the Ritz-Galerkin technique. The analysis was verified by applying it to the known results for t ... Cite

SOME PROPERTIES OF T-SEPTUM WAVEGUIDES.

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1987 Equations and curves giving cutoff frequency and impedance are presented for rectangular waveguides having a T-septum on one or both sides. It is shown that the T-septum waveguide has a lower cutoff frequency and wider bandwidth than a ridged waveguide of ... Cite

Characteristics of transverse electric and magnetic field transmission cells at extremely low frequencies.

Journal Article Bioelectromagnetics · 1987 Transverse electric and magnetic field (TEM) cells are often designed to subject samples to electromagnetic radiation of intrinsic impedance (E/H) that is the same as in free space, 377 omega. Earlier work has shown this value to be correct for the RF regi ... Full text Link to item Cite

EFFECTS OF AMBIENT LEVELS OF POWER-LINE-FREQUENCY ELECTRIC-FIELDS ON A DEVELOPING ORGANISM

Conference BIOPHYSICAL JOURNAL · 1987 Cite

Measurement of small mechanical vibrations of brain tissue exposed to extremely-low-frequency electric fields.

Journal Article Bioelectromagnetics · 1986 Electromagnetic fields can interact with biological tissue both electrically and mechanically. This study investigated the mechanical interaction between brain tissue and an extremely-low-frequency (ELF) electric field by measuring the resultant vibrationa ... Full text Link to item Cite

Off-center spherical model for dosimetry calculations in chick brain tissue.

Journal Article Bioelectromagnetics · 1986 This paper presents calculations for the electric field and absorbed power density distribution in chick brain tissue inside a test tube, using an off-center spherical model. It is shown that the off-center spherical model overcomes many of the limitations ... Full text Link to item Cite

Specific absorption rate in electrically coupled biological samples between metal plates.

Journal Article Bioelectromagnetics · 1986 The specific absorption rate (SAR) in a biological sample irradiated by electromagnetic fields between the metal plates of a transmission line can be altered significantly by the spacing of the metal plates and the distance between neighboring samples. The ... Full text Link to item Cite

Effect of 5-hydroxytryptamine on tissue blood flow and microwave heating of rat tumors.

Journal Article Cancer Res · July 1985 We have investigated the effect of 5-hydroxytryptamine (5-HT) on SMT-2A mammary adenocarcinoma blood flow during localized microwave hyperthermia treatment. Tissue blood flow in isogeneic female W/Fu rats was estimated using 25-micron-diameter 113Sn-labele ... Link to item Cite

Mechanisms and physiologic significance of microwave action on the auditory system

Journal Article Journal of Bioelectricity · January 1, 1985 Studies conducted by the authors and their coworkers on the mechanisms and physiologic significance of radiofrequency hearing effects are reviewed. Results of these studies demonstrate that thermoelastic expansion of fluids and structures within the inner ... Cite

Effects of continuous-wave, pulsed, and sinusoidal-amplitude-modulated microwaves on brain energy metabolism.

Journal Article Bioelectromagnetics · 1985 A comparison of the effects of continuous-wave, sinusoidal-amplitude-modulated, and pulsed square-wave-modulated 591-MHz microwave exposures on brain energy metabolism was made in male Sprague-Dawley rats (175-225 g). Brain NADH fluorescence, adenosine tri ... Full text Link to item Cite

A role for the magnetic field in the radiation-induced efflux of calcium ions from brain tissue in vitro.

Journal Article Bioelectromagnetics · 1985 Two independent laboratories have demonstrated that electromagnetic radiation at specific frequencies can cause a change in the efflux of calcium ions from brain tissue in vitro. In a local geomagnetic field (LGF) at a density of 38 microTesla (microT), 15 ... Full text Link to item Cite

Effects of ELF (1-120 Hz) and modulated (50 Hz) RF fields on the efflux of calcium ions from brain tissue in vitro.

Journal Article Bioelectromagnetics · 1985 We have previously shown that 16-Hz, sinusoidal electromagnetic fields can cause enhanced efflux of calcium ions from chick brain tissue, in vitro, in two intensity regions centered on 6 and 40 Vp-p/m. Alternatively, 1-Hz and 30-Hz fields at 40 Vp-p/m did ... Full text Link to item Cite

Mechanisms and physiologic significance of microwave action on the auditory system

Journal Article Journal of Bioelectricity · 1985 Studies conducted by the authors and their coworkers on the mechanisms and physiologic significance of radiofrequency hearing effects are reviewed. Results of these studies demonstrate that thermoelastic expansion of fluids and structures within the inner ... Cite

COMPUTER-SIMULATION OF CANCER THERMOTHERAPY

Journal Article MEDICAL PHYSICS · January 1, 1985 Link to item Cite

FREQUENCY-DEPENDENT ABSORPTION OF ELECTROMAGNETIC ENERGY IN BIOLOGICAL TISSUE.

Journal Article IEEE Transactions on Biomedical Engineering · 1984 The frequency-dependent absorption of electromagnetic energy in biological tissue is illustrated by use of the Debye equations, model calculations for different irradiation conditions, and measured electric properties (conductivity and permittivity) of dif ... Cite

The differential effects of 200, 591, and 2,450 MHz radiation on rat brain energy metabolism.

Journal Article Bioelectromagnetics · 1984 Three key compounds in brain energy metabolism have been measured during and after exposure to continuous wave radiofrequency radiation at 200, 591, and 2,450 MHz. Frequency-dependent changes have been found for all three compounds. Changes in NADH fluores ... Full text Link to item Cite

Internal field strength measurements in chick forebrains at 50, 147, and 450 MHz.

Journal Article Bioelectromagnetics · 1984 This report describes some experimental measurements of the internal field levels induced within isolated chick-forebrains irradiated at 50, 147, and 450 MHz, under essentially the same conditions as those used in the in vitro calcium-ion efflux experiment ... Full text Link to item Cite

The effects of hyperthermia and hyperthermia plus microwaves on rat brain energy metabolism.

Journal Article Bioelectromagnetics · 1984 The effects of hyperthermia, alone and in conjunction with microwave exposure, on brain energetics were studied in anesthetized male Sprague-Dawley rats. The effect of temperature on adenosine triphosphate concentration [ATP] and creatine phosphate concent ... Full text Link to item Cite

Frequency-dependent absorption of electromagnetic energy in biological tissue.

Journal Article IEEE Trans Biomed Eng · January 1984 Full text Link to item Cite

Microwave hyperthermia and its effect on tumor blood flow in rats.

Journal Article Cancer Res · October 1983 The present experiments were designed to investigate the effects of microwave hyperthermia on the microcirculation of normal and malignant tissues in female Wistar/Furth rats. During the localized heating of anesthetized rats, the hind leg musculature surr ... Link to item Cite

SELECTIVE HEATING OF MALIGNANT-TISSUE BY MICROWAVES IN THE 150 TO 400 MHZ RANGE

Conference RADIATION RESEARCH · January 1, 1983 Link to item Cite

AN EFFECT OF WEAK, ELF SIGNALS ON BRAIN-TISSUE, INVITRO

Conference BIOPHYSICAL JOURNAL · 1983 Cite

MICROWAVE EFFECTS ON RAT-BRAIN ENERGY-METABOLISM - HYPERTHERMIA AND OR DIRECT INTERACTION

Conference RADIATION RESEARCH · January 1, 1983 Link to item Cite

Effects of ELF fields on calcium-ion efflux from brain tissue in vitro.

Journal Article Radiat Res · December 1982 Link to item Cite

EFFECT OF MICROWAVE RADIATION (1. 0 GHz) ON THE BLOOD-BRAIN BARRIER IN DOGS.

Journal Article Radio Science · 1982 Utilizing an accepted pharmacological approach to the problem of evaluating the integrity of blood-brain barrier (BBB), the authors evaluated dogs following microwave radiation at 1. 0-GHz frequency and herein report their findings. The method involved can ... Cite

EFFECT OF LOCALIZED HYPERTHERMIA ON TUMOR BLOOD-FLOW

Conference RADIATION RESEARCH · January 1, 1982 Link to item Cite

Broadening of the RF power-density window for calcium-ion efflux from brain tissue.

Journal Article IEEE Trans Biomed Eng · August 1981 Full text Link to item Cite

Field-induced forces at dielectric interfaces as a possible mechanism of RF hearing effects.

Journal Article Bull Math Biol · 1981 Full text Link to item Cite

FREQUENCY RANGE OF LARGE-SCALE TEM MODE RECTANGULAR STRIP LINES.

Journal Article Microwave journal · 1981 Much confusion exists regarding the correct criteria for determining the cut-off frequency of the first higher order mode in rectangular strip lines. These criteria are reviewed, and it is shown that the actual frequency range of commercially-available TEM ... Cite

Microwave treatment of intracerebral L1210 leukemia: schedule-dependent partial reversal of the effects of methotrexate.

Journal Article Bioelectromagnetics · 1981 One-GHz microwave (MW) irradiation at a power density of 5 mW/cm2 was combined with methotrexate (MTX) in an attempt to treat more effectively central nervous system (CNS) L1210 leukemia in DBA/2J mice. When mice with CNS leukemia were treated with the com ... Full text Link to item Cite

Rebuttal

Journal Article International Journal of Radiation Oncology, Biology, Physics · 1981 Cite

Equalizing the electric field intensity within chick brain immersed in buffer solution at different carrier frequencies.

Journal Article Bioelectromagnetics · 1981 Presented here are the numerical relationships between incident power densities that produce the same average electric field intensity within a chick brain half immersed in buffered saline solution and exposed to a uniform electromagnetic field at carrier ... Full text Link to item Cite

Effects of 200 - 2450-MHz microwaves on rat-brain energy metabolism

Journal Article Aeromedical Reviews · 1981 Cite

Microwave power absorption differences between normal and malignant tissue.

Journal Article Int J Radiat Oncol Biol Phys · June 1980 Full text Link to item Cite

Alterations in activity at auditory nuclei of the rat induced by exposure to microwave radiation: autoradiographic evidence using [14C]2-deoxy-D-glucose.

Journal Article Brain Res · April 14, 1980 Autoradiographic maps of brain activity in rats exposed to pulsed or continuous-wave (CW) microwave radiation were made using [14C]2-deoxy-D-glucose ([14C]2-DG). Special emphasis was given to measurements of activity in the auditory system because previous ... Full text Link to item Cite

Inhibition of DNA synthesis and enhancement of the uptake and action of methotrexate by low-power-density microwave radiation in L1210 leukemia cells.

Journal Article Cancer Res · April 1980 We have studied the effects of low-power-density microwave (MW) radiation (continuous and pulsed wave with average power density of 10 milliwatts/sq cm and range of 5 to 50 milliwatts/sq cm; frequency, 1.0 GHz) on the uptake and action of methotrexate (MTX ... Link to item Cite

Microwave refraction in the eye.

Journal Article Ann Biomed Eng · 1980 Full text Link to item Cite

Calcium-ion efflux from brain tissue: power-density versus internal field-intensity dependencies at 50-MHz RF radiation.

Journal Article Bioelectromagnetics · 1980 In previous experiments changes were found in calcium-ion efflux from chick-brain tissue that had been exposed in vitro to 147-MHz radiation across a specific range of power densities when the field was amplitude modulated at 16 Hz. In the present study, 5 ... Full text Link to item Cite

Power density, field intensity, and carrier frequency determinants of RF-energy-induced calcium-ion efflux from brain tissue.

Journal Article Bioelectromagnetics · 1980 To explain a carrier frequency dependence reported for radiofrequency (RF)-induced calcium-ion efflux from brain tissue, a chick-brain hemisphere bathed in buffer solution is modeled as a sphere within the uniform field of the incident electromagnetic wave ... Full text Link to item Cite

OPTIMIZING THE DESIGN OF THE SIX-PORT JUNCTION.

Journal Article IEEE MTT-S International Microwave Symposium Digest · 1980 The Six-Port technique for measuring microwave network parameters is discussed. A set of optimum design objectives for this technique is derived from an examination of the system equations. ... Cite

Microwave effects on energy metabolism of rat brain.

Journal Article Bioelectromagnetics · 1980 Rat brain was exposed to 591-MHz, continuous-wave (CW) microwaves at 13.8 or 5.0 mW/cm2 to determine the effect on nicotinamide adenine dinucleotide, reduced (NADH), adenosine triphosphate (ATP) and creatine phosphate (CP) levels. On initiation of the in v ... Full text Link to item Cite

SYNTHESIS OF LUMPED AND DISTRIBUTED NETWORKS FOR IMPEDANCE MATCHING OF COMPLEX LOADS.

Journal Article IEEE Trans Circuits Syst · 1979 Numerically generated results based on existing theoretical restrictions are presented enabling the straight-forward synthesis of ladder type networks for matching a resistive source to a complex load. Transfer functions used in the synthesis allow increas ... Cite

MICROWAVE-ENERGY INDUCED LOCALIZED HYPERTHERMIA AND RADIOTHERAPY OF MALIGNANT-TUMORS

Conference RADIATION RESEARCH · January 1, 1978 Link to item Cite

NEW METHOD FOR MEASURING THE ELECTRICAL PROPERTIES OF SEA WATER AND WET EARTH AT MICROWAVE FREQUENCIES.

Journal Article IEEE Transactions on Instrumentation and Measurement · 1977 This paper describes a new method for measuring the dielectric constant of highly conductive materials with loss tangent greater than about 0. 1 and conductivity around 1 mho/m or greater, such as sea water and wet earth. The method can be used over a cont ... Cite

TEMPERATURE-CONTROLLED HEATING OF TUMORS BY MICROWAVES.

Journal Article · 1977 After a discussion of tissue electrical properties and vascularity, the microwave source and applicator requirements are presented to optimize the differential heating of cancerous tissue embedded in normal tissue. A method for automatically and accurately ... Cite

EXACT, TIME-SAVING SYNTHESIS PROCEDURE FOR UHF AND MICROWAVE NETWORKS.

Journal Article · 1977 An exact, yet labor-saving technique is developed for synthesizing low-pass and impedance-matching networks at UHF and microwave frequencies. Example designs are presented for maximally-flat magnitude and Chebyshev equal-ripple filter responses, and for ne ... Cite

Microwave-Power Absorption by Rectangular-Shaped Conductive Dielectric Samples in Stripline

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1976 A general method of calculating the power absorbed by a rectangular sample of material within the microwave field of a stripline is developed. Equations which account for the sample's disturbance of the otherwise uniform plane-wave field of the stripline a ... Full text Cite

Microwave-power absorption by rectangular-shaped conductive dielectric samples in stripline [biological materials appl.]

Journal Article IEEE Trans. Microw. Theory Tech. (USA) · 1976 A general method of calculating the power absorbed by a rectangular sample of material with the microwave field of a stripline is developed. Equations which account for the sample's disturbance of the otherwise uniform plane-wave field of the stripline are ... Cite

Reception of microwaves by the brain.

Journal Article Med Res Eng · 1976 The question of how pulsed microwaves induce auditory effects in animals and man leads to an examination of the parameters which determine the frequencies of maximum reception by the skull, and the positions of maximum energy deposition within the brain. T ... Link to item Cite

STRIPLINE TECHNIQUES IN THE STUDY OF MICROWAVE BIOLOGICAL EFFECTS ON ISOLATED NEURAL PREPARATIONS.

Journal Article · 1975 The action has been studied of microwaves on small isolated preparations, in some cases recording from a single neuron. There are several advantages in using the stripline irradiation technique. Most importantly, the power to the preparation and the electr ... Cite

RESONANCE ABSORPTION OF MICROWAVES BY THE HUMAN SKULL.

Journal Article IEEE Transactions on Biomedical Engineering · 1974 Resonance absorption of microwaves by the human skull is examined by making computerized calculations of theoretical models of the skull. The calculated relative absorption versus frequency is plotted and compared for homogeneous and inhomogeneous skull mo ... Cite

EFFECTS OF LOW-INTENSITY MICROWAVES ON ISOLATED NEURONS.

Journal Article Annals of the New York Academy of Sciences · 1974 The use of ganglia from the Marine gastropod Aplysia to study the effects of microwaves on isolated nerve cells is reported. In addition to the usual advantages of these ganglia for neural studies, they are much smaller in size (1 or 2 mm in diameter) than ... Cite

Resonance Absorption of Microwaves by the Human Skull

A semiclassical theory for nerve excitation by a low intensity electromagnetic field.

Journal Article Bulletin of mathematical biology · November 1973 Full text Cite

A Continuously Variable Dielectric Phase Shifter

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1971 A stripline phase shifter is described which yields a linear variable phase shift versus frequency. The phase shift is ac complished by varying the dielectric constant of the medium through which the signal propagates. Characteristic impedance is kept cons ... Full text Cite

The General Transfer Matrix for Networks with Open-Circuited or Short-Circuited Stubs

Journal Article IEEE Transactions on Circuit Theory · January 1, 1969 Full text Cite

The general transfer matrix for networks with open-circuited or short-circuited stubs

Journal Article IEEE Trans. Circuit Theory (USA) · 1969 Gives a set of combinatorial rules that enables one to write the composite transfer matrices of the networks without resorting to laborious matrix multiplications ... Cite

On using the Q of transmission lines

Journal Article IEEE Transactions on Microwave Theory and Techniques · 1968 The realization of bandpass filters and impedance-matching networks consisting of cascaded series and shunt segments of transmission line is facilitated by design procedure which relates the Q of individual frequency-selective sections to the total require ... Full text Link to item Cite

A nondestructive method for measuring the complex permittivity of dielectric materials at microwave frequencies using an open transmission line resonator

Journal Article IEEE Trans. Instrum. Meas. (USA) The method is based on perturbing the fringing field at the open end of the transmission line by an unknown dielectric material, and is applicable not only for solid dielectric materials but also for liquids and gases. Forming or shaping of solid dielectri ... Cite