新型L频段双圆极化微带阵列天线的设计

摘要

Circularly-polarized array antennas attract more and more attentions in the modern wireless applications because of its specific performance characteristics. A L-band circularly-polarized microstrip patch antenna working in wide axial ratio bandwidth is proposed. The antenna adopts the special double feed network, thus to provide 0 degree feed and 90 degree feed to the two adjacent sides of radiation patch respectively. Two layers of feed network are same in structural size, and connected through the bridge to ensure that the two adjacent sides of radiation patch have 90 degrees phase difference, thus improving circular polarization performance of the antenna. The simulation results show that the microstrip array antenna could work at 1.525~1.559 GHz; with double circular polarized antenna; antenna gain> 13 dBi; VSWR<1.5; E and H plane lobe width> 25°.%圆极化阵列天线由于其自身的性能特点，在现代无线应用中越来越受到广泛的关注。因此，提出一种宽轴比的L频段圆极化贴片天线。该天线采用特殊的双层馈电网络，分别为辐射贴片相邻的两个侧边提供0°和90°馈电。两层馈电网络结构尺寸完全相同，通过电桥连接两层馈电网络，以严格保证辐射贴片相邻两边的馈电幅度以及90°相位差，提高天线圆极化性能。设计结果显示，该天线工作在1.525～1.559 GHz，天线极化方式为左右旋双圆极化，天线增益＞13 dBi，驻波＜1.5，方向图E面波瓣宽度和H面波瓣宽度＞25°。