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Microwave Imaging Using a Disordered Cavity with a Dynamically Tunable Impedance Surface

Publication ,  Journal Article
Sleasman, T; Imani, MF; Gollub, JN; Smith, DR
Published in: Physical Review Applied
November 29, 2016

We perform microwave imaging using a dynamically reconfigurable aperture based on a tunable disordered cavity. The electrically large cavity is cubic with a spherical deformation and supports a multitude of distinct electromagnetic modes that vary as a function of excitation frequency. With a set of irises introduced into one wall of the cavity, the cavity modes couple to spatially distinct radiative modes that vary as a function of the driving frequency. To increase the diversity of the radiated fields, we replace one of the cavity walls with a variable impedance surface consisting of a set of varactor-populated mushroom structures grouped into pixels. The reflection phase of each pixel is independently changed with application of a voltage bias, effectively altering the surface impedance. We demonstrate high-fidelity imaging and examine the role of the impedance-tunable boundary condition, revealing superior performance in comparison with just frequency-diverse measurements. We also demonstrate single-frequency imaging, which can significantly reduce the demands on the required microwave source. The dynamic cavity imager may find relevance in security screening, through-wall imaging, biomedical diagnostics, and radar applications.

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Published In

Physical Review Applied

DOI

EISSN

2331-7019

Publication Date

November 29, 2016

Volume

6

Issue

5

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
 

Citation

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Sleasman, T., Imani, M. F., Gollub, J. N., & Smith, D. R. (2016). Microwave Imaging Using a Disordered Cavity with a Dynamically Tunable Impedance Surface. Physical Review Applied, 6(5). https://doi.org/10.1103/PhysRevApplied.6.054019
Sleasman, T., M. F. Imani, J. N. Gollub, and D. R. Smith. “Microwave Imaging Using a Disordered Cavity with a Dynamically Tunable Impedance Surface.” Physical Review Applied 6, no. 5 (November 29, 2016). https://doi.org/10.1103/PhysRevApplied.6.054019.
Sleasman T, Imani MF, Gollub JN, Smith DR. Microwave Imaging Using a Disordered Cavity with a Dynamically Tunable Impedance Surface. Physical Review Applied. 2016 Nov 29;6(5).
Sleasman, T., et al. “Microwave Imaging Using a Disordered Cavity with a Dynamically Tunable Impedance Surface.” Physical Review Applied, vol. 6, no. 5, Nov. 2016. Scopus, doi:10.1103/PhysRevApplied.6.054019.
Sleasman T, Imani MF, Gollub JN, Smith DR. Microwave Imaging Using a Disordered Cavity with a Dynamically Tunable Impedance Surface. Physical Review Applied. 2016 Nov 29;6(5).

Published In

Physical Review Applied

DOI

EISSN

2331-7019

Publication Date

November 29, 2016

Volume

6

Issue

5

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences