170 GHz和340 GHz CSMRs滤波器选频网络研究

170 GHz and 340 GHz frequency selective network based on CSMRs filter

为了实现倍频器多谐波输出,满足系统多频率需求,同时减少成本,增加系统集成度,引入了改进紧凑型悬置微带谐振单元(Compact Suspended Microstrip Resonators(CSMRs))滤波器,主要研究并实现了170 GHz和340 GHz双频段分别输出。仿真中分别设计170 GHz和340 GHz探针,引入CSMRs低通滤波器增加170 GHz对高频段的隔离,减小波导高度,提高WR.2.8波导截止频率,增加对300 GHz以下频段抑制,为了测试其输出特性和网络损耗,设计170~340 GHz背靠背模块。仿真结果为低通CSMRs滤波器满足在20~180 GHz通带内反射系数小于-18 d B,在266~520 GHz阻带内抑制度大于20 d B,背靠背结构仿真170 GHz与340 GHz频段反射系数均小于-15 d B,端口隔离大于30 d B,表现出良好的选频特性。测试结果表明:在170 GHz端口通带为150~185 GHz,反射系数小于-10 d B,损耗大于1.2 d B;在340 GHz端口,通带为306~355 GHz,反射系数小于-10 d B,损耗2 d B,两端口隔离度大于10 d B,最好60 d B。

In order to get different ha rmonics output of frequency multiplier, a 170 GHz and 340 GHz frequency selective network based on Compact Suspended Microstrip Resonators（CSMRs） filter was designed. The design met the multi-frequency requirements of systems, and the cost was reduced and the system integration degree was increased. In the simulation, the 170 GHz and 340 GHz probes were designed respectively. CSMRs low-pass filter was introduced to increase the isolation degree of 170 GHz and 340 GHz bands. The waveguide height was decreased, the cutoff frequency of the WR.2.8 waveguide was increased below 300 GHz. The measurement module was back-to-back of Selective Network. The simulation results show that CSMSRs filter has S11-18 d B between 20 GHz and 180 GHz,S12-20 d B between 266 GHz and 520 GHz. The back-to-back module S11 is better than-15 d B at 170 GHz and340 GHz bands, and two ports isolation degree is better than 30 d B. Measurement results show that S11-10 d B and transmission loss is better than 1.2 d B at 150-185 GHz. S11-10 d B between 306 GHzand 355 GHz, and transmission loss is 2 d B, two ports isolation degree is 10-60 d B.