一种顺序相移的超宽带馈电网络

A Sequential-phase Ultra-wideband Feeding Network

为了解决超宽带圆极化阵列的馈电问题,设计了一种顺序相移的超宽带馈电网络。该馈电网络由1个180°功率分配器,2个3 dB分支线耦合器,4个威尔金森功分器和4个45°移相器组成,适用于八单元圆形结构的顺序旋转阵列天线馈电。测试结果表明:该馈电网络具有频带宽、幅度相位特性良好等优点,在(3.9~10.1)GHz的频带内,馈电网络8个输出端口幅度起伏在2.33 dB以内,相位起伏在±7.3°以内。

For the feeding problem of ultra-wideband circularly polarized array,an ultra-wideband(UWB)feeding network with sequential-phase(SP)is designed.The feed network is composed by a 180°power divider,two 3-dB branch line coupler,four Wilkinson power dividers and 45°phase shifter.It can be applied to the circular polarized array with eight rotated elements.The proposed network is fabricated and measured.The measured results show that the feeding network has the advantages of wide frequency band,good amplitude and phase characteristics.From 3.9 GHz to 10.1 GHz,the outputting amplitude fluctuation and phase fluctuation of the eight ports is within 2.33 dB and±7.3°respectively.