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International Journal of Antennas and Propagation
Volume 2012, Article ID 423706, 9 pages
Research Article

Characterization of a Coplanar Waveguide Open Stub-Based Discontinuity for MMICs and Filter Applications

1National Engineering and Scientific Commission, Islamabad 44000, Pakistan
2School of Electrical Engineering, The University of Faisalabad, Faisalabad 38000, Pakistan

Received 5 April 2012; Revised 25 June 2012; Accepted 11 July 2012

Academic Editor: Charles Bunting

Copyright © 2012 Rizwan Masood and Syed A. Mohsin. 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.


This paper presents the analysis and design of an open stub-based two-port discontinuity in a coplanar waveguide. The discontinuity has a good bandpass response and the required design characteristics were achieved by using the method of moments (MOM) and the finite integration technique (FIT). The analysis is found to be computationally efficient which makes the discontinuity suitable for use in complex structure applications. The analysis of the discontinuity is also formulated using the quasi-static finite-difference technique. The proposed discontinuity structure finds applications in RFICs and MMICs. Finally, the application of the discontinuity is supported by the simulated design of a broadband bandpass filter on an MMIC with a relative bandwidth of 96%. The filter is found to have a miniature size and a fairly good stop band rejection.