LTCC多级结构实现高性能微型带通滤波器的研究

LTCC多级结构实现高性能微型带通滤波器的研究

内容简介：提出了一种基于LTCC多级结构实现高性能微型带通滤波器的实现方法。该滤波器电路由6个由电感耦合的谐振腔组成。在一般抽头式梳状线滤波器设计的基础上，引入了交叉耦合，形成传输零点，并结合电路仿真以及三维电磁场仿真，辅之以DOE的设计方法，设计出了一种尺寸小、频率选择性好、边带陡峭、阻带抑制高的滤波器。实际测试结果与仿真结果吻合较好，中心频率为2.925 GHz，其1 dB带宽为170 MHz，在1~2.703 GHz频率上的衰减均优于35 dB，在3.147~6 GHz频率上的衰减均优于35 dB，体积仅为4.5 mm×3.4 mm×1.5 mm。

Abstract：An implementation method of high-performance miniature bandpass filter based on LTCC multistage structure is proposed. The filter circuit is composed of six resonant cavities composed of inductive coupling. The transmission zeros were re-alized by cross-coupling. Based on the design of the tapped combline filter,a small size filter with high frequency selectivity, steep sideband and high stopband rejection was designed with the help of DOE,circuit simulation and 3-D EM simulation. The measured results of the filter agree well with the electromagnetic simulation. Simulation and measured results show that the band-pass filter has a central frequency of 2.925 GHz,the 1 dB bandwidth is 170 MHz,the stop-band attenuation is better than 35 dB at 1~2.703 GHz and 35 dB at 3.147~6 GHz. The final size of the fabricated filter is only 4.5 mm×3.4 mm×1.5 mm.

作者：戴永胜, 陈相治,

关键词：高性能带通滤波器, LTCC, 谐振腔, 传输零点