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Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators.

Publication ,  Journal Article
Maccarini, PF; Arunachalam, K; Martins, CD; Stauffer, PR
Published in: Proceedings of SPIE--the International Society for Optical Engineering
February 2009

The use of conformal antenna array in the treatment of superficial diseases can significantly increase patient comfort while enhancing the local control of large treatment area with irregular shapes. Originally a regular square multi-fed slot antenna (Dual Concentric Conductor - DCC) was proposed as basic unit cell of the array. The square DCC works well when the outline of the treatment area is rectangular such as in the main chest or back area but is not suitable to outline diseases spreading along the armpit and neck area. In addition as the area of the patch increases, the overall power density decreases affecting the efficiency and thus the ability to deliver the necessary thermal dose with medium power amplifier (<50W). A large number of small efficient antennas is preferable as the disease is more accurately contoured and the lower power requirement for the amplifiers correlates with system reliability, durability, linearity and overall reduced cost. For such reason we developed a set of design rules for multi-fed slot antennas with irregular contours and we implemented a design that reduce the area while increasing the perimeter of the slot, thus increasing the antenna efficiency and the power density. The simulation performed with several commercial packages (Ansoft HFSS, Imst Empire, SemcadX and CST Microwave Studio) show that the size reducing method can be applied to several shapes and for different frequencies. The SAR measurements of several DCCs are performed using an in-house high resolution scanning system with tumor equivalent liquid phantom both at 915 MHz for superficial hyperthermia systems in US) and 433 MHz (Europe). The experimental results are compared with the expected theoretical predictions and both simulated and measured patterns of single antennas of various size and shapes are then summed in various combinations using Matlab to show possible treatment irregular contours of complex diseases. The local control is expected to significantly improve while maintaining the patient comfort.

Duke Scholars

Published In

Proceedings of SPIE--the International Society for Optical Engineering

DOI

EISSN

1996-756X

ISSN

0277-786X

Publication Date

February 2009

Volume

7181

Related Subject Headings

  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering
 

Citation

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MLA
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Maccarini, P. F., Arunachalam, K., Martins, C. D., & Stauffer, P. R. (2009). Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators. Proceedings of SPIE--the International Society for Optical Engineering, 7181. https://doi.org/10.1117/12.809952
Maccarini, Paolo F., Kavitha Arunachalam, Carlos D. Martins, and Paul R. Stauffer. “Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators.Proceedings of SPIE--the International Society for Optical Engineering 7181 (February 2009). https://doi.org/10.1117/12.809952.
Maccarini PF, Arunachalam K, Martins CD, Stauffer PR. Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators. Proceedings of SPIE--the International Society for Optical Engineering. 2009 Feb;7181.
Maccarini, Paolo F., et al. “Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators.Proceedings of SPIE--the International Society for Optical Engineering, vol. 7181, Feb. 2009. Epmc, doi:10.1117/12.809952.
Maccarini PF, Arunachalam K, Martins CD, Stauffer PR. Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators. Proceedings of SPIE--the International Society for Optical Engineering. 2009 Feb;7181.

Published In

Proceedings of SPIE--the International Society for Optical Engineering

DOI

EISSN

1996-756X

ISSN

0277-786X

Publication Date

February 2009

Volume

7181

Related Subject Headings

  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering