This article presents a novel design of filtering reflectarray antenna, an integrated module for the combination of filtering and high-gain radiation performance. The filtering reflectarray consists of two-section metal pixel waveguide elements, which can realize the optimized aperture reflection phase distributions in the operating band $f_{1~ \le }f~ _{\le }~f_{2}$ to yield high-gain radiation. Below the lower cutoff frequency $f_{1}$ , the reflection phase distributions drastically deviate from the required ones. Above the upper cutoff frequency $f_{2}$ , both the amplitude and phase distributions fail to provide strong coherent radiation. In the reflectarray synthesis process, a multi-frequency phase matching method (PMM) is further developed, in which the phase compensation for each pixel is implemented at three simultaneous in-band frequencies. Meanwhile, the effects of incident angle for elements are also taken into consideration during the reflectarray synthesis. The design of an $11\lambda \times 11\lambda $ filtering reflectarray operating from 55 to 65 GHz was conveniently fabricated by 3-D printing technology, followed by metal coating with advantages of rapid prototyping, lightweight, and low cost. Both the simulated and measured results show that the proposed reflectarray can realize high-gain radiation within the desired frequency band but presents effective suppression of out-of-band signals, demonstrating its filtering capability.

中文翻译：

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用于毫米波应用的高增益滤波反射阵列天线

本文介绍了一种新颖的滤波反射阵列天线设计，它是一种结合滤波和高增益辐射性能的集成模块。滤波反射阵列由两段金属像素波导元件组成，可在工作波段实现优化的孔径反射相位分布 $f_{1~ \le }f~ _{\le }~f_{2}$ 产生高增益辐射。低于下截止频率 $f_{1}$ ，反射相位分布大大偏离了所需的分布。高于上限截止频率 $f_{2}$ ，幅度和相位分布都不能提供强相干辐射。在反射阵列合成过程中，进一步开发了一种多频相位匹配方法（PMM），其中每个像素的相位补偿在三个同时的带内频率上实现。同时，在反射阵列合成过程中还考虑了元件入射角的影响。一个设计 $11\lambda \times 11\lambda $ 工作频率为 55 至 65 GHz 的滤波反射阵列通过 3-D 打印技术方便地制造，其次是金属涂层，具有快速成型、重量轻和成本低的优点。仿真和实测结果均表明，所提出的反射阵列可以在所需频段内实现高增益辐射，但对带外信号具有有效抑制，证明了其滤波能力。