星载双频双端口天线设计

Satellite dual-frequency dual-port antenna design

针对星载收发机的使用需求,设计了一种双频段、双端口、双天线共口径的微带天线。通过辐射贴片加载短路过孔技术,配合外部方形圆孔贴片和内部圆形贴片切角技术,使双天线均工作在主模。双天线共口径工作,分别辐射左旋圆极化和右旋圆极化波,有效降低星载双天线布局复杂度。仿真结果表明:天线在中心频点1.615 GHz处回波损耗为-13 dB,10 dB带宽为50 MHz,增益为6 dB,半功率波束宽度为90°,±60°波束内轴比小于3 dB;天线在中心频点2.491 GHz处回波损耗为-18 dB,10 dB带宽为40 MHz,增益为6 dB,半功率波束宽度为90°,±60°波束内轴比小于3 dB;双端口隔离度优于32 dB。经加工,实测结果与仿真结果一致,该天线对星载双频段、双端口共口径天线设计具有一定指导意义。

Aiming at the needs of satellite transceivers,a dual-band,dual-port,dual-antenna common-aperture microstrip antenna was designed.Both antennas work in the main mode by the radiation patch loading short via technology,with the external square patch and the internal circular patch corner cutting technology.Dual antennas work in common aperture,radiating left-handed circular polarization(LHCP)and right-handed circular polarization(RHCP)waves respectively,the complexity of the satellite dual antenna layout is reduced effectively.The simulation results show that the antenna has a return loss of-13 dB at the frequency of 1.615 GHz,the 10 dB bandwidth of 50 MHz,the gain of 6 dB,the half-power beam width of 90°,and the±60°beam axis ratio less than 3 dB;the antenna has a return loss of-18 dB at the frequency of 2.491 GHz,the 10 dB bandwidth of 40 MHz,the gain of 6 dB,the half-power beam width of 90°,and the±60°beam axis ratio less than 3 dB;the dual-port isolation is better than 32 dB.After processing,the actual measurement results are consistent with the simulation results,and the antenna has certain guiding significance for the design of dual-band,dual-port common-aperture antennas on satellites.