具有高阻带衰减的LTCC级联带通滤波器的研究  

The research of LTCC cascaded bandpass filter with high stopband rejection characteristics

作　　者：陈相治 戴永胜[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《微型机与应用》2014年第19期27-29,33,共4页Microcomputer & Its Applications

摘　　要：提出了一种基于LTCC级联技术的边带陡峭高阻带抑制多级带通滤波器的实现方法。该滤波器电路由两个谐振部分级联而成,每个部分均由电感耦合的四阶谐振腔组成。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(Design Of Experiment)的设计方法,设计出一种尺寸小、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3.25 GHz,其1 d B带宽为300 MHz,在1 GHz^2.86 GHz频率上的衰减均优于60 d B,在3.64 GHz^3.84 GHz频率上的衰减均优于80 d B,在4.08 GHz^5.8GHz频率上的衰减均优于60 d B,体积仅为6.1 mm×2.5 mm×1.5 mm。A LTCC concatenation technology based on the steep side with high stopband suppression method for multi-level band-pass filter is proposed. The filter circuit is composed of two cascaded resonant part, each part is composed of four order resonant inductive coupling.The transmission zeros were realized by cross-coupling. Based on the design of the tapped combline filter, combined with circuit simulation and 3-D EM simulation, the filter which can achieve a small size, high selectivity, sideband steep, high stopband rejection was designed with the help of DOE. 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 3.25 GHz, that the 1 d B bandwidth is 300 MHz, that the stop-band attenuation is more than 60 d B from 1 GHz to 2.86 GHz, and more than 80 d B from 3.64 GHz to 3.84 GHz, more than 60 d B from 4.08 GHz to 5.8 GHz. The final size of the fabricated filter is only 6.1 mm×2.5 mm×1.5 mm.

关 键 词：高抑制 LTCC 带通滤波器 传输零点 

分 类 号：TN713[电子电信—电路与系统]