一种宽带双极化波导阵列天线的设计

The Design of Wideband and Dual-polarized Waveguide Antenna Arrays

设计了一种适用于雷达、通信等领域的宽带双极化波导阵列天线。天线的垂直极化信号通过波导阻抗变换直接馈电实现,水平极化信号通过由垂直极化信号馈电、缝隙耦合的方式实现。设计的阵列天线在12 GHz～15 GHz的频带内驻波比小于2,交叉极化低于25 dB,单元增益在带内大于8 dB,波束宽度大于60°。加工天线后实测结果与仿真结果吻合,该种阵列天线既适合固定波束阵列天线,又适合具有相扫功能的阵列天线。

A wideband and dual-polarization waveguide antenna array is designed, which can be used in the radar and satellite communication field. In this kind of antenna, the vertical polarization signal is produced by waveguide impedance transformation, while the horizontal polarization signal is realized by slot coupling feeding that the original signal is still the vertical polarized form. The designed antenna has a wideband with VSWR〈2 in 12 GHz - 15 GHz band, low cross polarization below -25 dB, high gain beyond 8 dBi and half-power pattern angle over 60°. The results obtained from the simulation model and the manufactured agree much well. And the antenna arrays not only can be applied in single beam system but in the phased scanning occasion.