This paper designed a circularly polarized (CP) Fabry-Perot (F-P) resonant cavity antenna which utilized a frequency selective surface (FSS)-based partial reflecting surface (PRS). The loading thin single-layer FSS-based PRS is composed of patches on the top layer of the substrate and square loop slots on the bottom. With the obtained positive slope for the reflection coefficient phase of the loading PRS, the operating bandwidth of the F-P resonant cavity antenna is expanded. In order to further expand the bandwidth, we introduced a sequentially rotating feeding network to excite a 2 × 2 CP patch array, which is used as a feed source for the resonant cavity antenna. By experiment, the actual measured |S11| < −10 dB impedance bandwidth is 26.9%, while the 3-dB axial ratio (AR) bandwidth is approximately 17%. A maximum gain of 15.4 dBic and a radiation efficiency is 86.8% are achieved, which indicate that the proposed antenna is a promising candidate for CP communication applications.

中文翻译：

---

一种基于频率选择表面的部分反射面的圆极化法布里-珀罗谐振腔天线

本文设计了一种圆极化 (CP) 法布里-珀罗 (FP) 谐振腔天线，该天线利用基于频率选择表面 (FSS) 的部分反射面 (PRS)。加载薄的单层基于 FSS 的 PRS 由基板顶层的贴片和底部的方形环槽组成。利用获得的负载PRS反射系数相位的正斜率，扩展了FP谐振腔天线的工作带宽。为了进一步扩大带宽，我们引入了一个顺序旋转的馈电网络来激发一个 2 × 2 CP 贴片阵列，用作谐振腔天线的馈源。经实验，实测|S11| < -10 dB 阻抗带宽为 26.9%，而 3-dB 轴比 (AR) 带宽约为 17%。最大增益 15。