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The Scientific World Journal
Volume 2014, Article ID 915740, 5 pages
Research Article

Novel Hexagonal Dual-Mode Substrate Integrated Waveguide Filter with Source-Load Coupling

Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 611731, China

Received 19 August 2013; Accepted 16 October 2013; Published 22 April 2014

Academic Editors: G. De Mey and G. Priebe

Copyright © 2014 Ziqiang Xu 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.


Hexagonal dual-mode cavity and its application to substrate integrated waveguide (SIW) filter are presented. The hexagonal SIW resonator which can combine flexibility of rectangular cavity and performance of circular cavity is convenient for dual-mode bandpass filters design. By introducing coupling between source and load, the filter not only has good selectivity due to two controllable transmission zeros, but also has a small size by the virtue of its single-cavity structure. A demonstration filter with a center frequency of 10 GHz and a 3 dB fractional bandwidth of 4% is designed and fabricated to validate the proposed structure. Measured results are in good agreement with simulated ones.