基于并联功分馈电的双频低副瓣CTS天线设计

Design of Dual-Band Low Sidelobe CTS Antenna Based on Parallel Power Divider

针对卫星通信系统的多功能化应用需求,设计一款双频、低副瓣并馈连续横向枝节(Continuous Transverse Stub,CTS)天线。天线采用共享口径,并联馈电与辐射枝节非均匀能量分布相结合的方式实现双频低副瓣特性,并用平行板双工器实现高/低频信号的隔离。仿真结果显示,天线在两个频段内(17.7~21.2 GHz、27.5~31 GHz)E面副瓣电平均低于-20 dB,端口隔离度在低频优于20 dB,高频优于25 dB,增益分别为26.4~27.6 dB和30.6~31.4 dB,口径效率分别为75%~82%和85%~89%。

To meet the requirements of multi-functional application of satellite communication system,a dual-band,low sidelobe and continuous transverse stub(CTS)antenna is designed.The characteristics of dual-band low side lobe are realized by means of shared aperture,parallel feed and non-uniform energy distribution of radiation stubs,and high/low frequency port isolation is realized by parallel plate duplexer.The simulation results show that in two frequency bands(17.7~21.2 GHz and 27.5~31 GHz),the sidelobe levels are below-20 dB in E-plane,the port isolation is better than 20 dB at low frequency and better than 25 dB at high frequency,the gain is 26.4~27.6 dB and 30.6~31.4 dB respectively,and the aperture efficiency is 75%~82%and 85%~89%respectively.