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本文设计了一种毫米波双魔T结构的单脉冲右旋圆极化微带阵列天线。针对微带天线经典“H”形馈电类型在单元间距较小时不再适用的问题,设计混合馈电网络以减小馈线与贴片单元的互耦,并在天线背面采用双魔T结构的波导和差网络馈电。这种结构设计在一定程度上减小了馈电插入损耗。为减小平行长馈线间耦合,采用了在两级馈电网络间加隔离贴片的方法,有效地隔离了平行馈线间的耦合,消除部分表面波影响,保证了功率分配。仿真结果与实测结果吻合较好。
In this paper, we designed a single-pulse, right-handed circularly polarized microstrip array antenna with millimeter-wave dual-magic T structure. Aiming at the problem that the microstrip antenna’s classic “H” shaped feed type is no longer applicable when the cell spacing is small, a hybrid feed network is designed to reduce the mutual coupling between the feeder and the patch cell. A dual magic T Structure of waveguide and differential network feed. This structural design to a certain extent reduce the feed insertion loss. In order to reduce the coupling between long and parallel feeder lines, an isolation patch is added between the two feeder networks to effectively isolate the coupling between parallel feeders and eliminate the influence of some surface waves and ensure the power distribution. The simulation results agree well with the measured results.