This paper presents the design of a wideband single-layer partially reflective surface (PRS) for a circularly-polarized (CP) resonant cavity antenna (RCA). The proposed single layer double-sided PRS structure has complementary design which results in an increase in the 3-dB gain bandwidth of the antenna over a wide bandwidth due to creating both inductive and capacitive features. Indeed, this complementary structure gives opposite phase behavior which leads to a reverse phase gradient over a wide range of frequencies. Instead of using conventional multi-layer PRS structures or PRSs with thick unit cell for broaden the bandwidth, we have used a thin single-layer PRS structure with the capability to enhance the antenna gain over a wide bandwidth. A CP stacked patch antenna (SPA) is used as a main radiating element inside the RCA structure. To verify the significant effect of the proposed PRS on the antenna performance, the entire RCA structure is fabricated and the results show a reasonable agreement between simulations and measurements. The measurement results show an 3-dB axial ration (AR) and impedance bandwidths of 21% and 32%, respectively. The antenna gain is more than 10.5 dBic over the 3-dB gain bandwidth from 5.8 to 7.3 GHz, i.e 22.9%, with a peak gain of 13.2 dBic.

本文介绍了用于圆极化（CP）谐振腔天线（RCA）的宽带单层部分反射表面（PRS）的设计。所提出的单层双面PRS结构具有互补设计，由于创建了感性和容性特征，因此在较宽的带宽上导致天线的3-dB增益带宽增加。实际上，这种互补结构具有相反的相位行为，这会导致在很宽的频率范围内出现反相梯度。代替使用常规的多层PRS结构或具有较厚单位单元的PRS来加宽带宽，我们使用了薄的单层PRS结构，该结构具有在较宽的带宽上增强天线增益的能力。CP堆叠式贴片天线（SPA）用作RCA结构内部的主要辐射元件。为了验证所提出的PRS对天线性能的显着影响，制造了整个RCA结构，结果表明仿真和测量之间存在合理的一致性。测量结果显示3 dB的轴向比率（AR）和阻抗带宽分别为21％和32％。在5.8至7.3 GHz的3 dB增益带宽上，天线增益大于10.5 dBic，即22.9％，峰值增益为13.2 dBic。