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提出了一种带滤波功能的2×2圆极化可控阵列天线,采用探针对每个辐射贴片进行馈电,通过控制辐射贴片的激励相位和极化,实现整个阵列天线的圆极化特性.嵌入在阵列天线馈电网络中的耦合谐振器对保证了馈电网络在幅度响应上呈现滤波特性的同时,在相位上控制每个辐射贴片激励端口处的信号相位在-90°和90°之间变化,同时结合90°移相网络,可实现对整个阵列天线左旋圆极化(LHCP)和右旋圆极化(RHCP)的控制.实测结果表明:该阵列天线能控制辐射的圆极化特性,并获得优异的LHCP和RHCP特性;在两种极化状态下,阵列天线工作频带内均具有较为平坦的增益特性,平均增益为10.4 dBic,带外增益特性呈现较好的滤波特性,在远离通带上、下边带100 MHz处增益抑制均达到8.6 dB以上.“,”A 2×2 filtering circularly polarized antenna array with controllable polarization characteristics is presented in this paper.A 90° phase shifter and four coupled λ/2-resonator pairs have been used to feed the antenna array and generate the filtering response and controlling the circular polarization characteristics simultaneously.By adjusting the output feeding port positon of the coupled λ/2-resonator pair,the output signal phase shifts from +90° to-90°.With proper arrangement of the four coupled λ/2-resonator pairs and one 90° phase shifter,the left-hand circular polarization (LHCP) or righthand circular polarization (RHCP) of proposed antenna array can be controlled.Moreover,both for the LHCP and RHCP,the proposed antenna array have an average in-band gain of 10.4 dBic,out-of-band rejections of greater than 8.6 dB at the frequencies of 100 MHz lower/higher than the passband edges.