X频段连续波100 kW吸收式谐波滤波器研制

Research and development of continous wave 100 kW absorption harmonicfilter in X-band

为了抑制深空探测高功率发射机谐波能量对接收机的干扰,提出了一种基于渐变漏壁式波导加载吸收负载结构的超大功率谐波滤波器.分析了该结构滤波器衰减损耗特性,并结合电磁场仿真软件,对滤波器整体结构进行了仿真,依据仿真尺寸对滤波器进行了结构设计和样件加工,经过对样件测试,滤波器通带最大插入损耗小于0.3 dB,二次、三次及四次谐波抑制度分别大于75, 50, 35 dB,测试结果与仿真结果基本一致.对滤波器样件进行了高功率实验,在外加液冷条件下,连续波功率容量可达100 kW以上,成功研制出了一种X频段吸收式超大功率谐波滤波器,并已经应用于某型号大功率地面发射机,指标性能良好.

A gradient leaky-wall waveguide loaded absorbing load filter structure is proposed, which is designed for harmonic suppression in super-high power transmitter of deep-space probe. The attenuation loss characteristics of the filter is analyzed according to the equivalent circuit method, and the massive structure is simulated by the electromagnetic field simulation software. The filter sample which includes one main waveguide, 288 deputy waveguides and 288 absorb loads is processed following the simulating and designing sizes. In order to prevent microwave from leaking and keep good air tightness under the condition of high power, all the components of the filter will be welded together by means of vacuum welding, and then the sample is cleaned ultrasonically. Finally, the filter sample is tested under small signal and large signal separately. According to our test results, the pass band max insertion loss of the filter is 0.3 dB, the min suppression of second harmonic is 75 dB, the min suppression of third harmonic is 50 dB, and the min suppression of fourth harmonic is 35 dB. The measured results show that they are almost the same as the simulation results, and consistent completely with the anticipated. We further conduct the high power experiment on the filter under a large signal of 100 kW, showing that the continuous wave power capacity of the filter can reach up to 100 kW through the power resistance test with the liquid-cooled system. All the test data show that the study and development are very successful. At present, the filer has been applied to a type of ground high power transmitter, and its performances and indicators behave well.