一种Ka波段集成化滤波功分器设计

Design of a Ka-band Integrated Filtering Power Divider

针对Ka波段毫米波探测与通信系统的高集成度、低损耗和高功率容量的要求,设计了一款集成滤波和功率分配功能的传输网络。采用耦合矩阵设计腔体滤波器,通过修正滤波器腔体间的耦合系数实现等功率分配。最终设计的全谐振腔结构可以在实现五阶滤波功能的同时,达到一分四等幅度同相位的功率分配。为了验证该设计的性能,使用金属三维打印技术对该滤波功分器进行一体化加工。测试结果表明,该滤波功分器可以在26.9~30.7 GHz的频率上实现优于14 dB的回波损耗,以及在4个输出端口实现约6.4 dB的插入损耗,实测结果与仿真结果一致。传输网络整体尺寸为58 mm×46 mm×18 mm。

In order to meet the requirements of high integration,low loss and high power capacity of Ka-band millimeter-wave detection and communication system,a transmission network with integrated filtering and power distribution is designed.A cavity filter is designed by using coupling matrix,and equal power distribution is realized by modifying the coupling coefficient between filter cavities.The all-resonator structure can not only realize the function of the 5-order filter,but also the power distribution with four equal amplitudes.To verify the performance of the designed structure,metal 3D printing technology is used for the fabrication of filtering power divider.The results show that the filtering power divider can achieve a return loss less than 14 dB in 26.9~30.7 GHz as well as an insertion loss of about 6.4 dB on four output ports.The experimental results are coherent with the simulation results.The size of the transmission network is 58 mm×46 mm×18 mm.