Compact microstrip bandpass filters using triple‐mode resonator are investigated in this paper. At the center frequency of 2.45 GHz, a half‐wavelength microstrip open‐circuited resonator is loaded with a chip capacitor and a chip inductor to realize the triple‐mode resonator. By adjusting the resonator's parameters, the first three resonant mode frequencies could be tuned for bandpass filters with various fractional bandwidths. Three bandpass filters with different measured bandwidths (13.8%, 55.5%, 98.6%) are designed, fabricated, and tested to validate the design concept.

中文翻译：

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使用带集总元件的三模谐振器的紧凑型微带通滤波器

本文研究了使用三模谐振器的紧凑型微带通滤波器。在2.45 GHz的中心频率处，一个半波长微带开路谐振器装有一个片状电容器和一个片状电感器，以实现三模谐振器。通过调整谐振器的参数，可以为具有不同分数带宽的带通滤波器调整前三个谐振模式频率。设计，制造和测试了三个具有不同测量带宽（13.8％，55.5％，98.6％）的带通滤波器，以验证设计理念。