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为了提高基站的通信质量,研制了高性能的窄带介质带通滤波器。选择切比雪夫低通原型设计线路,采用6个环形介质谐振器直接耦合实现滤波器,输入输出采用探针耦合。用HFSS软件对滤波器的结构进行了仿真。用εr=38的高Q值介质陶瓷材料制作了环形谐振器,分析了衬垫材料的高度对环形谐振器性能的影响,测试了级间耦合系数。最后制作出中心频率为6GHz的介质带通滤波器,滤波器的带宽窄(0.5%),插入损耗较小,阻带衰减很高,达到了国内先进水平。
In order to improve the communication quality of the base station, a high-performance narrow-band dielectric band-pass filter has been developed. Select Chebyshev low-pass prototype design line, the use of 6 ring dielectric resonator direct coupling to achieve the filter, the input and output probe coupling. The structure of the filter was simulated with HFSS software. Ring resonators were fabricated using a high-Q dielectric ceramic material with εr = 38. The effect of the height of the spacer material on the performance of the ring resonator was analyzed. The interstage coupling coefficient was tested. Finally, a dielectric band-pass filter with a center frequency of 6 GHz is fabricated. The filter has a narrow bandwidth (0.5%), a small insertion loss and a high attenuation of the stop band, reaching the advanced domestic level.