一种双圆极化宽带天线及其阵列应用

A Double Circular Polarization Broadband Antenna and Its Array Applications

该文设计了一种双圆极化宽带天线单元,并在此基础上实现了小型阵列天线。单元天线为层叠型微带天线,其辐射贴片的四周寄生了环形金属带和金属柱以拓展波束宽度。另外,为了满足双圆极化要求和拓展天线带宽,天线采用电桥进行馈电。天线单元的10 dB阻抗带宽为26.9%(1.8~2.36 GHz),3 dB轴比带宽为19.3%(1.92~2.33 GHz),方向图半功率波束宽度大于110°。对非规则的五单元面阵进行了研究。测试结果表明,该天线阵的合成增益高于11.5 dBi,±55°扫描增益高于9 dBi,仿真和实验结果一致性较高,为宽带卫星通信的应用奠定了基础。

A double circular polarization broadband antenna is designed,and a small array is realized on this basis.The element antenna is a stacked microstrip antenna with a ring of metal bands and metal columns around the radiation patch to expand the beam width.In addition,in order to meet the requirements of double circular polarization and to expand the antenna bandwidth,the antenna is fed by a ring bridge.The 10 dB impedance bandwidth is 26.9%(1.8 GHz^2.36 GHz),the 3 dB axial ratio bandwidth is 19.3%(1.92~2.33 GHz),and the 3 dB beam width is greater than 110°.A non-regular five elements array is investigated.The test results show that the synthetic gain is higher than 11.5dBi,and the±55°scanning gain is higher than 9dBi.The simulation and experimental results are consistent,which is the foundation of broadband satellite communication application.