A novel resonant cavity antenna (RCA) with low sidelobe levels over an enhanced bandwidth is presented. Radiation bandwidth of the antenna is increased by using a pair of complementary FSS layers, giving a positive reflection phase over a wide frequency range, as the proposed PRS. Low sidelobes are achieved by lowering the reflection amplitude of the PRS along its length while keeping reflection phase almost the same throughout the operating band. The performance of the proposed PRS is validated by creating a circular aperture RCA and measuring its radiation characteristics. The cavity is excited by an aperture coupled patch antenna having a broad impedance bandwidth. Prototype RCA gives a peak realized gain of 16.1 dBi and a 3-dB gain bandwidth of 8.6% ranging from 14.5 to 15.8 GHz. Measured sidelobe levels are reduced, respectively, to less than −17 dB and −23 dB in the E- and H-plane of the prototype antenna.

中文翻译：

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使用锥形互补 FSS 层的增强带宽、低旁瓣谐振腔天线

提出了一种在增强的带宽上具有低旁瓣电平的新型谐振腔天线 (RCA)。通过使用一对互补的 FSS 层来增加天线的辐射带宽，在很宽的频率范围内提供正反射相位，如所提出的 PRS。通过降低 PRS 沿其长度的反射幅度同时在整个工作频带内保持反射相位几乎相同来实现低旁瓣。通过创建圆形孔径 RCA 并测量其辐射特性来验证所提出的 PRS 的性能。该腔由具有宽阻抗带宽的孔径耦合贴片天线激发。原型 RCA 在 14.5 至 15.8 GHz 范围内提供 16.1 dBi 的峰值实现增益和 8.6% 的 3-dB 增益带宽。测量的旁瓣电平分别降低，