基于双同轴阶跃阻抗谐振器的带通腔体滤波器的设计

The design of a cavity bandpass filter based on double coaxial stepped impedance resonator

介绍了一种减小腔体滤波器体积的设计方法。分析了双同轴阶跃阻抗谐振器的谐振条件和未加载Q值,依据滤波器理论和运用HFSS软件设计了一个基于双同轴阶跃阻抗谐振器的带通腔体滤波器。在3.7～3.9 GHz的频带内,该滤波器插入损耗小于0.5 dB,回波损耗大于20 dB,测试与仿真结果相吻合。该滤波器具有体积小、结构简单易于加工等优点。

A method of reducing the size of the cavity filter is introduced. The resonance conditions and the unloaded Q value of the double coaxial stepped impedance resonator （DC-SIR） are analyzed, and a DC-SIR-based cavity bandpass filter is designed through the HFSS according to the filter theory. The simulation results of the filter show that the insertion loss is less than O. 5 dB and the echo loss is more than 20 dB within the range from 3.7 to 3.9 GHz, which are in accordance with the test results. The filter has many advantages such as small size, simple structure and easy machining.