Design of a Microstrip Transmission Line Filter with Transmission Zeros

doi:10.13190/jbupt.201205.77.zhuyzh

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2012, Vol. 35 ›› Issue (5): 77-80.doi: 10.13190/jbupt.201205.77.zhuyzh

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Design of a Microstrip Transmission Line Filter with Transmission Zeros

ZHU Yong-zhong, ZHAO Zhi-yuan

Department of Communication Engineering,Engineering University of the Chinese Peoples Armed Police Force

Received:2011-11-05 Revised:2012-05-11 Online:2012-10-28 Published:2012-07-06
Contact: Yong-Zhong ZHU E-mail:bsbs1980@sina.com

Abstract

Abstract:

A design method for asymmetric two-cavity hairpin filter is proposed. Firstly, by using transmission matrices, the relation between the types of serial coupled microstrip transmission line and transmission zeros of transfer response is analyzed. and then, the transmission response formula of the parallel-coupled transmission line filter is derived through even and odd-mode excitations. The serial and parallel microstrip line structures are applied to the design of a two-pole microstrip hairpin filter with asymmetric feed. A N-order cross coupling network with source-load coupling can realize a maximum number of transmission zeros that can equal to N. Compared with source-load coupling, the new two-pole hairpin filter which can obtain three transmission zeros has improved selectivities. A good agreement between measured and simulated data has been reached.

Key words: filter, transmission line, transmission zero, even and odd-mode

CLC Number:

TN713. 5

ZHU Yong-zhong, ZHAO Zhi-yuan. Design of a Microstrip Transmission Line Filter with Transmission Zeros[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2012, 35(5): 77-80.

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Design of a Microstrip Transmission Line Filter with Transmission Zeros

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