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Homogenizing microwave illumination in thermoacoustic tomography by a linear-to-circular polarizer based on frequency selective surfaces

He, Yu and Shen, Yuecheng and Feng, Xiaohua and Liu, Changjun and Wang, Lihong V. (2017) Homogenizing microwave illumination in thermoacoustic tomography by a linear-to-circular polarizer based on frequency selective surfaces. Applied Physics Letters, 111 (6). Art. No. 063703. ISSN 0003-6951. https://resolver.caltech.edu/CaltechAUTHORS:20170809-134617557

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Abstract

A circularly polarized antenna, providing more homogeneous illumination compared to a linearly polarized antenna, is more suitable for microwave induced thermoacoustic tomography (TAT). The conventional realization of a circular polarization is by using a helical antenna, but it suffers from low efficiency, low power capacity, and limited aperture in TAT systems. Here, we report an implementation of a circularly polarized illumination method in TAT by inserting a single-layer linear-to-circular polarizer based on frequency selective surfaces between a pyramidal horn antenna and an imaging object. The performance of the proposed method was validated by both simulations and experimental imaging of a breast tumor phantom. The results showed that a circular polarization was achieved, and the resultant thermoacoustic signal-to-noise was twice greater than that in the helical antenna case. The proposed method is more desirable in a waveguide-based TAT system than the conventional method.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4993942DOIArticle
http://aip.scitation.org/doi/10.1063/1.4993942PublisherArticle
ORCID:
AuthorORCID
Shen, Yuecheng0000-0003-1990-8142
Liu, Changjun0000-0003-0079-6793
Wang, Lihong V.0000-0001-9783-4383
Additional Information:© 2017 American Institute of Physics. Received 2 July 2017; accepted 31 July 2017; published online 9 August 2017. This work was supported in part by the China 973 program 2013CB328902 and the China Scholarship Council.
Funders:
Funding AgencyGrant Number
China 973 progam2013CB328902
China Scholarship CouncilUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20170809-134617557
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170809-134617557
Official Citation:Homogenizing microwave illumination in thermoacoustic tomography by a linear-to-circular polarizer based on frequency selective surfaces Yu He, Yuecheng Shen, Xiaohua Feng, Changjun Liu, and Lihong V. Wang Applied Physics Letters 2017 111:6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80023
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:09 Aug 2017 21:05
Last Modified:03 Oct 2019 18:26

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