An Antipodal Vivaldi Antenna Design for Torso Imaging in a Coupling Medium

Joof S., Doğu S., Bilgin E., Çayören M.

15th European Conference on Antennas and Propagation (EuCAP), ELECTR NETWORK, 22 - 26 March 2021 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.23919/eucap51087.2021.9411436
  • Country: ELECTR NETWORK
  • Keywords: Antipodal Vivaldi antenna (AVA), microwave imaging (MWI), linear sampling method (LSM), VERIFICATION
  • Istanbul Technical University Affiliated: Yes

Abstract

An antipodal Vivaldi antenna designed to operate in a coupling medium with a relative dielectric constant of epsilon(r) = 25 for microwave imaging of torso is presented in this paper. The proposed antenna is similar to the conventional antipodal Vivaldi antenna but with optimized parameters to radiate in the desired coupling medium. The antenna has a size of 120x70 mm(2) and operating over 230-1000 MHz frequency bandwidth with a peak gain of 5.42 dBi and peak front-to-back ratio of 143 dB. The designed antenna shows a better performance compared to other antennas used for microwave torso imaging. To assess the actual performance, a realistic human torso phantom is implemented to detect the water accumulation in the lungs, and as the inversion method linear sampling method is used. The 3-D reconstruction results show that the proposed antenna can be a candidate for microwave torso imaging applications.