A linear-to-circular polarization converter based on I-shaped circular frequency selective surfaces

• Published in: Chinese physics B 2017-08, Vol.26 (9), p.184-189
• Main Author: 吴家梁 林宝勤 达新宇 吴凯
• Format: Article
• Language: English
• Subjects: GHz; 圆极化器; 循环; 数值模拟; 线性; 结构谐振; 频率选择性; 频率选择表面
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/26/9/094201

In this paper, a linear-to-circular polarization converter using a three-layer frequency selective surface based on Ishaped circular structure resonant is presented and investigated. Numerical simulations exhibit that when the normal ypolarized waves impinge on this device propagating towards ＋z direction, the two orthogonal components of the transmitted waves have a 90° phase difference as well as the nearly equal amplitudes at the resonant frequency of 7.04 GHz, which means that the left-hand circular polarization is realized in transmission. For validating the proposed design, a prototype which consists of 25 × 25 elements has been designed, manufactured and measured. The measured results are in good agreement with the simulated ones, showing that the polarization conversion transmission is over-3 dB in the frequency range of 5.22–8.08 GHz and the axial ratio is below 3 dB from 5.86 GHz to 7.34 GHz.