Compact multi-band transversal bandpass filters with source–load coupling

Zhenhao LaiSchool of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Road, Hightech Area (west), Chengdu611731, P.R. ChinaCorrespondence[email protected]

Zongxi TangSchool of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Road, Hightech Area (west), Chengdu611731, P.R. China

Xiaowu ZhanSchool of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Road, Hightech Area (west), Chengdu611731, P.R. China

Xin CaoSchool of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Road, Hightech Area (west), Chengdu611731, P.R. China

Yunqiu WuSchool of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Road, Hightech Area (west), Chengdu611731, P.R. China

Biao ZhangSchool of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Road, Hightech Area (west), Chengdu611731, P.R. China

Abstract

A method in designing multi-band bandpass filter is proposed in this paper. This design employs source and load cross-coupling technique and transversal structure with stub-loaded dual-mode resonators. The proposed filters are miniaturized by using stub-loaded dual-mode resonators, and half of the resonators are reduced compared with traditional SIR filters. What is more, the dual-mode resonators and the source–load cross-coupling can introduce more transmission zeros to improve frequency selectivity. It is demonstrated by the simulated and measured results that the novel filters have the advantages of low in-band insertion loss, good out-band rejection, and compact size. This proposed filter can be applied in the microwave circuits and wireless communication systems.

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Acknowledgment

This work is supported by National Natural Science Foundation of China (Grant No. 61201004) and the Fundamental Research Funds for the Central Universities (ZYGX2011J011).

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Compact multi-band transversal bandpass filters with source–load coupling

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Compact multi-band transversal bandpass filters with source–load coupling

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