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Active and Passive Electronic Components
Volume 2014, Article ID 436964, 4 pages
Research Article

Harmonic-Rejection Compact Bandpass Filter Using Defected Ground Structure for GPS Application

1State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing 100083, China
2College of Information Engineering, East China of Jiaotong University, Nanchang 330013, China

Received 31 December 2013; Accepted 14 March 2014; Published 3 April 2014

Academic Editor: Huikai Xie

Copyright © 2014 Haiwen Liu 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.


A miniaturized bandpass filter (BPF) using defected ground structure (DGS) resonator with the characteristic of harmonic rejection is developed in this paper. The second and third harmonics of the proposed BPF are rejected by the characteristic of stepped-impedance DGS resonator. Moreover, open stubs are established so that two adjustable transmission zeros can independently be created to extend the stopband and improve the rejection level. Finally, a second-order BPF, centered at 1.62 GHz with a stopband extended up to 5.6 GHz and a rejection level better than 20 dB, is designed and implemented for GPS application. A good agreement between simulation and measurement verifies the validity of this design methodology.