一种宽带宽波束圆极化微带天线的设计

Design of a Broad Band Wide Beam Circular Polarization Microstrip Antenna

本文设计了一种宽带宽波束圆极化微带天线,并对其进行了分析。利用双层辐射贴片来增加天线带宽,同时通过在天线周围增加金属墙来实现波束宽度的展宽。仿真结果表明天线在电压驻波比小于2时,带宽达到了700MHz(从3.56GHz^4.26GHz),同时波束宽度可以达到115°。最终利用具有90°相位差的功分器给天线馈电,使该天线具有良好的增益、带宽和轴比的特性。

A broad band wide beam circular polarization microstrip antenna is designed and analyzed. The antenna uses double-layer circular patch to broad bandwidth. The antenna is enclosed by a folded conducting wall so that a wide radiation beam is achieved. The simulated results indicate that the bandwidth of the antenna is 700 MHz(from 3.56 GHz to 4.26 GHz) while the VSWR is less than 2 and the half-power beamwidth can achieve 115°.The antenna is realized with a good gain and a good circular polarization fed by a power divider with 90°phase difference.