ABSTRACT

This paper describes a new design strategy which is used to obtain a fivefold increase in the 3 dB axial ratio bandwidth of linear to circular polarization convertors based on anisotropic frequency selective surfaces composed of single screens of cross slots. The performance improvement is obtained by employing stratified dielectric media to carefully tailor the shape of the TE and TM spectral transmission responses. We demonstrate that a bandwidth of 24.5% can be achieved at a center operating frequency of 10.6 GHz using an array of unequal length cross-slots embedded centrally between two 2.25 mm thick dielectric slabs (ε_r = 9.0). Moreover it is shown that the inherent self-filtering behavior of the structure provides greater rejection of unwanted signals than designs embedded in lower permittivity material. Computed and experimental axial ratio results are compared to verify the new design methodology.

摘要

本文描述了一种新的设计策略，该策略用于基于由单个交叉缝隙屏幕组成的各向异性频率选择表面的线性到圆偏振转换器的 3 dB 轴比带宽增加五倍。通过使用分层介电介质来仔细调整 TE 和 TM 光谱传输响应的形状，可以获得性能改进。我们证明了在 10.6 GHz 的中心工作频率下可以实现 24.5% 的带宽，使用不等长的交叉槽阵列可以在两个 2.25 毫米厚的电介质板（ε _r = 9.0）。此外，结果表明，与嵌入在较低介电常数材料中的设计相比，该结构的固有自滤波行为可以更好地抑制不需要的信号。计算和实验轴比结果进行比较以验证新的设计方法。