【摘要】 设计了一个小型化全向微带滤波天线。天线由带通滤波器和微带天线组成，二者共用一个地平面以减小尺寸且采用缝隙耦合方式连接，带通滤波器蚀刻在微带贴片天线的馈线位置处，引入选频滤波功能，在输入馈线前端添加一个横向矩形贴片使整个系统达到良好的阻抗匹配。与传统的微带天线相比，所设计的滤波天线在不改变尺寸大小的基础上引入了选频滤波功能，在通带边缘体现出较高的选择性。仿真与测试结果表明，该滤波天线的阻抗带宽为2.31 GHz～2.56 GHz，且通带内增益平缓，平均增益约为2.1 dBi，在工作频段内呈全向辐射特性。更多还原

【Abstract】 A miniaturized omnidirectional microstrip filter antenna is designed. The antenna is composed of a bandpass filter and a microstrip antenna, which share a ground plane to reduce the size and are connected by gap coupling. The bandpass filter is etched at the feeder position of the microstrip patch antenna, and the frequency selection filter function is introduced. A transverse rectangular patch is added at the front end of the input feeder to achieve good impedance matching of the whole system.Compared with the traditional microstrip antenna, the designed filter antenna introduces the frequency selection filter function without changing the size, and shows high selectivity at the edge of the passband. The simulation and test results show that the impedance bandwidth of the filter antenna is 2.31 GHz～2.56 GHz, and the gain in the passband is flat, the average gain is about 2.1 dBi, and the filter antenna has omnidirectional radiation characteristics in the working frequency band.更多还原