In this article, we present a design method of high-selectivity filtering antennas based on a dual-probe feeding structure. The first stage of the filtering circuit consists of two or three coupled resonators which are then coupled to the radiating patch acting as the last resonator of the filter. Cross-coupling is used to obtain transmission zero, and thus the selectivity of the filtering antennas is improved. A cascaded triplet (CT) filtering patch antenna, which produces a radiation zero at the high-frequency edge of the passband, and a cascaded quadruplet (CQ) filtering patch antenna, which produces radiation zeros at both edges of the passband, are designed for verification. The process of designing the filtering patch antenna is given in detail. The designed CT filtering patch antenna has a bandwidth of 1.029–1.17 GHz and a radiation zero at 1.19 GHz. The designed CQ filtering patch antenna has a bandwidth of 1.029–1.17 GHz and two radiation zeros at 1.012 and 1.19 GHz, respectively. The peak gain of the CT filtering patch antenna is 9.35 dBi and that of the CQ filtering patch antenna is 9.16 dBi. A dual-polarized CQ filtering patch antenna is fabricated, showing a good performance in measurement.

中文翻译：

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基于多径耦合结构的高选择性滤波贴片天线

在本文中，我们提出了一种基于双探针馈电结构的高选择性滤波天线的设计方法。滤波电路的第一级由两个或三个耦合的谐振器组成，然后耦合到用作滤波器最后一个谐振器的辐射贴片。使用交叉耦合来获得传输零，从而提高了滤波天线的选择性。为在通带的高频边缘产生零辐射的级联三重态（CT）滤波贴片天线和在通带的两个边缘产生零辐射的级联四联（CQ）滤波贴片天线被设计用于确认。详细介绍了滤波贴片天线的设计过程。设计的CT滤波贴片天线的带宽为1.029–1。17 GHz，零辐射为1.19 GHz。设计的CQ滤波贴片天线的带宽为1.029-1.17 GHz，分别在1.012和1.19 GHz处具有两个辐射零点。CT滤波贴片天线的峰值增益为9.35 dBi，而CQ滤波贴片天线的峰值增益为9.16 dBi。制作了双极化CQ滤波贴片天线，在测量中表现出良好的性能。