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介绍了一种基于LTCC工艺的梳状线带通滤波器的设计方法,滤波器包含四个谐振单元,每个谐振单元采用多层交叠带线结构。利用电磁仿真软件HFSS提取输入输出谐振单元的外部Q值以及谐振单元间的耦合系数,通过在第一级与第四级谐振单元之间引入Z型容性耦合,在上下边带各插入一个传输零点,提高带外抑制能力。实测结果显示,滤波器在中心频率3.35GHz处的插入损耗小于3dB,-1dB带宽大于400 MHz,带外抑制在DC-2.5GHz内大于40dB,在4~8GHz内大于30dB。
A design method of a comb line bandpass filter based on LTCC technology is introduced. The filter includes four resonant units, and each resonant unit adopts a multi-layer overlapping strip line structure. Using the electromagnetic simulation software HFSS to extract the external Q value of the input-output resonant unit and the coupling coefficient between the resonant units, a Z-type capacitive coupling is introduced between the first-stage and the fourth- Zero, improve out of band suppression. The measured results show that the insertion loss of the filter at the center frequency of 3.35GHz is less than 3dB, the bandwidth of -1dB is greater than 400MHz, the out-of-band rejection is greater than 40dB in DC-2.5GHz and greater than 30dB in 4 ~ 8GHz.