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为验证首次提出的以耦合双间隙腔替代传统的双同轴腔作为腔体滤波器的基本单元的可行性,本文采用等效电路法推导了耦合双间隙腔两端加载同轴线之后的传输函数,研究了耦合双间隙腔的滤波特性,并利用三维仿真验证了解析推导结果的正确性。为了更好地理解耦合双间隙腔滤波性能的优劣性,采用三维仿真的方法比较了耦合双间隙腔滤波器和双同轴腔滤波器的传输特性和体积,结果表明,在两者的间隙宽度相同的情况下,耦合双间隙腔滤波器比双同轴腔滤波器有较大的1dB带宽和较小的体积,但通带下降沿比较平缓。该研究结论将为今后发展以耦合双间隙腔为基本单元的小型化大功率金属腔体滤波器提供有力的理论支持。
In order to verify the feasibility of replacing the traditional double coaxial cavity with the coupling double gap cavity as the basic unit of the cavity filter for the first time, the equivalent circuit method is used to derive the transmission after the coaxial line is loaded at both ends of the coupled double gap cavity Function, the filter characteristics of the coupled double gap cavity are studied, and the correctness of the analytical derivation result is verified by the three-dimensional simulation. In order to better understand the advantages and disadvantages of the performance of the coupled double-gap cavity filter, the transmission characteristics and volume of the coupled double-gap filter and double-coaxial cavity filter are compared by the three-dimensional simulation method. The results show that in the gap When the width is the same, the coupling double-gap filter has a larger 1dB bandwidth and a smaller volume than the double-coaxial filter, but the pass-band falling edge is relatively flat. The conclusions of this study will provide strong theoretical support for the future development of miniaturized high-power metal-cavity filters with dual gap cavities as the basic unit.