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

2017 ◽  
Vol 111 (6) ◽  
pp. 063703 ◽  
Author(s):  
Yu He ◽  
Yuecheng Shen ◽  
Xiaohua Feng ◽  
Changjun Liu ◽  
Lihong V. Wang
Keyword(s):  
Frequency Selective Surfaces ◽  
Thermoacoustic Tomography ◽  
Circular Polarizer ◽  
Frequency Selective

A Multilayer Circular Polarizer Based on Bisected Split-Ring Frequency Selective Surfaces

2014 ◽  
Vol 13 ◽  
pp. 153-156 ◽  
Author(s):  
Lourdes Martinez-Lopez ◽  
Jorge Rodriguez-Cuevas ◽  
Jose I. Martinez-Lopez ◽  
Alexander E. Martynyuk
Keyword(s):  
Frequency Selective Surfaces ◽  
Split Ring ◽  
Circular Polarizer ◽  
Frequency Selective ◽  
Ring Frequency

scholarly journals Broadband Circular Polarizer Based on Multilayer Gradual Frequency Selective Surfaces

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Wei Zhang ◽  
Jian-ying Li ◽  
Ling Wang
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Incident Angle ◽  
Reduction Factor ◽  
Frequency Selective Surfaces ◽  
Layer By Layer ◽  
Circular Polarizer ◽  
Working Frequency ◽  
Frequency Selective ◽  
Operation Frequency

This paper presents a broadband circular polarizer based on multilayer gradual frequency selective surfaces. The unit cell includes two identical circles and a bar, whose dimensions decrease layer by layer with a reduction factor. This design can provide a good phase difference that is close to 90°. The bandwidth of the polarizer reaches 66.7%, from 7.9 to 15.8 GHz, which can convert the incident linear polarization waves into circular polarization waves. A sample polarizer is fabricated and measured. The results show that the operation frequency ranges from 7.75 to 15.2 GHz, coinciding with the simulation. Meanwhile, the working frequency band covers the range of 8.2–14.5 GHz when the incident angle increases to 25°.

Nonuniformly illuminated frequency-selective surfaces

1988 ◽  
Vol 24 (14) ◽  
pp. 901 ◽  
Author(s):  
A.M.M.A. Allam ◽  
E.A. Parker
Keyword(s):  
Frequency Selective Surfaces ◽  
Frequency Selective

Ultra-wideband and low-loss linear-to-circular polarizer based on multilayer frequency selective surface

2021 ◽  
Vol 127 (2) ◽  
Author(s):  
Ping Wang ◽  
Yu Wang ◽  
Yanwen Hu ◽  
Hongcheng Zhou ◽  
Zhongming Yan ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Ultra Wideband ◽  
Low Loss ◽  
Circular Polarizer ◽  
Frequency Selective
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