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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 174023, 6 pages
Research Article

Broadband Microstrip Bandpass Filter Based on Open Complementary Split Ring Resonators

GEMMA/CIMITEC, Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, Barcelona 08193 Bellaterra, Spain

Received 6 September 2012; Accepted 26 October 2012

Academic Editor: Alejandro Lucas Borja

Copyright © 2012 P. Vélez 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.


Broadband bandpass filters based on open complementary split ring resonators (OCSRRs) coupled through admittance inverters, and implemented in microstrip technology, are reported. As compared to other broadband filters based on open split ring resonators (OSRRs), ground plane etching is not necessary in the proposed filters. The selectivity of the filters at the upper transition band is improved thanks to the presence of a controllable transmission zero. To demonstrate the potential of this approach, two illustrative prototype devices have been designed and fabricated.