滤波器耦合槽直径对其性能的影响仿真

Simulation of Coupling Aperture Diameter and Its Influence to Filter Properties

采用高频结构模拟软件模拟1/4λ同轴型带通微波陶瓷滤波器结构,讨论了耦合槽直径对滤波器的性能如带宽、插损、带内波动、阻带抑制等的影响。结果表明,随着耦合槽直径的增大,滤波器中心频率、插入损耗和阻带抑制减小,3dB带宽增大。讨论结果表明,可通过调整滤波器耦合槽直径的大小,得到理想性能的介质滤波器。

In this study the relation between the structure parameter (such as coupling aperture diameter d) of 1/4λ microwave band-pass dielectric filter and its final microwave properties(such as bandwidth, passband ripple , insertion loss and stop-band attenuation ) is discussed . The results show that with the increasing of coupling aperture diameter, center frequency, insertion loss and stop-band attenuation decrease while 3 dB band width increase. According to the results discussed above ,an ideal dielectric filter can be acquired by changing the coupling aperture diameter.