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Journal of Electromagnetic Waves and Applications Volume 26, 2012 - Issue 11-12
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Articles

Ultra-wideband bandpass filters with triple and quad frequency notched bands

Y.-L. Dong School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, ChinaCorrespondence[email protected]
,
C.-M. Sun School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China
,
W.-Y. Fu School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China
&
W. Shao School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China
Pages 1624-1630 | Received 10 May 2012, Accepted 18 Jun 2012, Published online: 19 Jul 2012
 
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Abstract

Two novel ultra-wideband (UWB) bandpass filters (BPFs) with multiple notched bands are presented. A stub-loaded multiple-mode resonator is used to realize an ultra-wide bandwidth, and two L-shape folded shunt open-circuited stubs are placed on the feed lines to control the quantity and frequency of notched bands within the desired bandwidth. This improves the selectivity and rejection of the filters as well. Then the stepped impedance structure connected with the feed lines on both sides is introduced to enhance the return loss performance. Finally, the prototypes of the UWB BPFs with triple and quad notched bands are implemented and measured. A good agreement between the predicted and measured results is obtained.

Acknowledgment

This work is supported by the Fundamental Research Funds for the Central Universities (ZYGX2009J041 and ZYGX2010J043), the National Natural Science Foundation of China (60901023), and the DPR Foundation (9140A03011210DZ02).

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