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Active and Passive Electronic Components
Volume 2017, Article ID 1606341, 6 pages
https://doi.org/10.1155/2017/1606341
Research Article

Design of a SIW Bandpass Filter Using Defected Ground Structure with CSRRs

1School of Electronic Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Ave., West Hi-Tech Zone, Chengdu 611731, China
2School of Information Engineering, East China Jiaotong University, No. 88, Shuanggang Road, Nanchang 330013, China

Correspondence should be addressed to Weiping Li; moc.621@7728pwl

Received 20 October 2016; Revised 28 December 2016; Accepted 10 January 2017; Published 29 January 2017

Academic Editor: Guangya Zhou

Copyright © 2017 Weiping Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper, a substrate integrated waveguide (SIW) bandpass filter using defected ground structure (DGS) with complementary split ring resonators (CSRRs) is proposed. By using the unique resonant properties of CSRRs and DGSs, two passbands with a transmission zero in the middle have been achieved. The resonant modes of the two passbands are different and the bandwidth of the second passband is much wider than that of the first one. In order to increase out-of-band rejection, a pair of dumbbell DGSs has been added on each side of the CSRRs. The structure is analyzed using equivalent circuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured. The measurement results are in good agreement with the simulated ones.