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文章设计了一款基于开路分支线加载双模谐振器的微带带通滤波器。通过对开路分支线加载双模谐振器的奇偶模特性及固有传输零点分析,利用调节分支线的长度可以灵活地调整谐振器的固有传输零点位置这一特性,采用了两个具有不同分支线长度的谐振器实现了一个高选择性滤波器的设计与测试,测试结果与仿真结果基本一致。所设计的滤波器中心频率为2.45 GHz,通带宽度为150 MHz,通带内插损小于1.5 dB,具有两个位于2.27 GHz和2.57 GHz的传输零点,在2.0 GHz与2.95 GHz处的衰减分别达到41 dB和29.8 dB。此外,该滤波器尺寸小巧,设计加工方便,具有一定的实用价值。
This paper designs a microstrip bandpass filter based on open branch line loading dual mode resonator. Through the analysis of the odd and even modes and the inherent transmission zero of the dual-mode resonator loaded with the open branch, the characteristic of the inherent transmission zero point of the resonator can be flexibly adjusted by adjusting the length of the branch line. Two different branches with different branch line lengths Of the resonator to achieve a highly selective filter design and testing, test results and simulation results are basically the same. The designed center frequency of the filter is 2.45 GHz, the passband width is 150 MHz, the passband insertion loss is less than 1.5 dB, two transmission zeros at 2.27 GHz and 2.57 GHz, the attenuation at 2.0 GHz and 2.95 GHz, respectively Reaching 41 dB and 29.8 dB. In addition, the filter size, design and processing convenience, has a certain practical value.