A Broadband Dual Circularly Polarized Patch Antenna With Wide Beamwidth

A broadband dual circularly polarized patch antenna with wide beamwidth is presented. The patch is excited by four cross slots via a microstrip line with multiple matching segments underneath the ground plane. The four cross slots and the multiple matching segments are optimized simultaneously to obtain the best performance. Measurements show that the antenna has 10-dB return-loss bandwidth of 24%, 10-dB isolation bandwidth of 19%, 3-dB axial-ratio bandwidth of 16%, and beamwidth of 110 degrees. Moreover, the single feed makes it a good candidate for array design.

提出了一种具有宽波束宽度的宽带双圆极化贴片天线。该贴片通过地平面下方具有多个匹配段的微带线由四个交叉缝隙激励。同时对四个交叉缝隙和多个匹配段进行优化以获得最佳性能。测量表明，该天线具有24%的10 dB回波损耗带宽、19%的10 dB隔离带宽、16%的3 dB轴比带宽以及110度的波束宽度。此外，单馈电使其成为阵列设计的良好候选。