This letter presents a dual-polarized and dual-frequency reflectarray backed by a frequency selective surface (FSS) with application to shared aperture Ku/Ka-band satellite communication antennas. The reflectarray has been designed to operate simultaneously at 20 and 30 GHz (downlink and uplink frequencies in Ka-band) using a single-layer configuration, where the printed elements are etched on the upper substrate of a two-layer triband FSS. The FSS has been designed to be transmissive at 12 GHz (downlink frequency in Ku-band) and reflective at 20 and 30 GHz. An 18 × 18-cm2 prototype has been fabricated and tested, showing a good matching with the simulations. The measured gains are 28.5 dBi at 20 GHz and 32.25 dBi at 30 GHz.

中文翻译：

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由 FSS 支持的 20/30 GHz 反射阵列，用于共享孔径 Ku/Ka 波段卫星通信天线

这封信提出了一种双极化和双频反射阵列，由频率选择表面 (FSS) 支持，可应用于共享孔径 Ku/Ka 波段卫星通信天线。反射阵列设计为使用单层配置在 20 GHz 和 30 GHz（Ka 波段的下行链路和上行链路频率）同时运行，其中印刷元件蚀刻在两层三频 FSS 的上基板上。FSS 设计为在 12 GHz（Ku 频段的下行链路频率）下传输，在 20 和 30 GHz 下反射。已经制造并测试了一个 18 × 18-cm2 的原型，显示出与模拟的良好匹配。测得的增益在 20 GHz 时为 28.5 dBi，在 30 GHz 时为 32.25 dBi。