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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 879653, 5 pages
http://dx.doi.org/10.1155/2014/879653
Research Article

A New Microstrip Filter Using CRLH Structure and Defected Ground Structure in Antenna Application

1School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2Institute of Astronautics and Aeronautics, University of Electronic Science and Technology of China, Chengdu 611731, China

Received 10 December 2013; Revised 23 March 2014; Accepted 6 April 2014; Published 22 April 2014

Academic Editor: Z. N. Chen

Copyright © 2014 Xin Cao 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

A new microstrip bandpass filter using composite right/left-handed (CRLH) mushroom structure with interdigital capacitors and defected ground structure (DGS) is proposed. The proposed filter uses CRLH mushroom structure working at its first negative resonance mode to create the passband and DGS to increase rejection outside the passband. Simulation and measurement results are in good agreement, and low in-band insertion loss and great out-band rejection have been achieved. It is demonstrated that the combination of CRLH mushroom structure with interdigital capacitors and DGS has succeeded in achieving excellent performance. This new filter can be applied in transmitting and receiving antennas.