一种结构简单的滤波短路贴片天线

A Simple Filtering Shorted-Patch Antenna

微带天线广泛应用于军事和民用领域,将滤波功能集成到该类天线中,实现带外信号抑制的同时可有效减小射频前端的总体尺寸。本文在微带贴片天线的基础上,设计了一种结构简单的滤波短路贴片天线。该天线由一个刻有J形缝隙的短路辐射贴片和一个短路寄生贴片组成。J形缝隙与寄生贴片分别在低/高频带引入辐射零点,以实现天线的滤波响应。测试结果表明,该天线的阻抗带宽3.7% (4.76~4.94 GHz),带内增益约5.0 dBi,E面半功率波束宽度约100˚,带外辐射抑制大于12.6 dB。

Microstrip antennas are widely used in military and civilian fields, the filtering function is inte-grated into this type of antenna, which can achieve out-of-band signal suppression and effectively reduce the overall size of the RF front-end. In this paper, a simple filtering shorted-patch antenna based on the microstrip patch antenna is designed. The antenna consists of a shorted driven patch with J-shaped slots and a shorted parasitic patch. Filtering response is obtained because of the ra-diation nulls introduced by J-shaped slots and the parasitic patch. Measured results show that the impedance bandwidth of the antenna is 3.7% (4.76~4.94 GHz), the in-band gain is about 5.0 dBi, and the E-plane half-power beamwidth is about 100˚, the out-of-band radiation suppression is more than 12.6 dB.