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具有谐波抑制特性的LTCC带通滤波器新设计
戴永胜,韩群飞,尹洪浩,左同生,谢秋月
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(南京理工大学电子工程与光电技术学院，南京 210094)

摘要:

提出了一种新型的具有多次谐波抑制功能的低温共烧陶瓷(LTCC)微型带通滤波器，该滤波器电路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，通过改进其结构，形成了多个传输零点，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，设计出了一种尺寸小、频率选择性好、阻带宽的滤波器。实际测试结果与仿真结果吻合较好，中心频率为13 .4 GHz，其3 dB带宽为200 MHz，在15.5～35 GHz频率上的衰减均优于 20 dB，体积仅为3.2 mm×1.6 mm×1.2 mm。所提方法对滤波器谐波抑制的设计具有指导作用。

关键词: 带通滤波器交叉耦合低温共烧陶瓷谐波抑制

DOI：

基金项目:国家重点基础研究发展计划(973计划)(2009CB320201)；国家国防重点实验室基金项目(9140C1402021102)

A new design of LTCC band-pass filter with harmonics suppression

DAI Yong-sheng,HAN Qun-fei,YIN Hong-hao,ZUO Tong-sheng,XIE Qiu-yue

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Abstract:

A novel lowtemperature cofired ceramics(LTCC) bandpass filter(BPF) with sp urious responses suppression is proposed. The circuit of this filter is composed of 4order resonant cavity by inductance coupling. The more transmission zeros are realized by adding modified crosscoupling. Based on the design of the tap ped combline filter, combined with circuit simulation and 3D EM(Electromagneti c) simulation, the filter which can achieve a small size, high selectivity, wide stopband responses is designed with the help of DOE(design of experiment). Th e measured results of the filter agree well with the electromagnetic simulation. Simulation and measured results show that the BPF has a central frequency of  13.4 GHz,the 3 dB bandwidth is 200 MHz,and the stopband attenuation is more than 20 dB from 15.5 GHz to 35 GHz. The final size of the fa bricated filter is only 3.2 mm×1.6 mm×1.2 mm. The proposed method is of guidance for the design of filters with harmonics suppression.

Key words: band-pass filter (BPF) cross-coupling LTCC harmonics suppression