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Wideband suppression of spurious response for microstrip filters based on coupled lines of incommensurate lengths

Published online by Cambridge University Press:  13 August 2014

Sang-Ho Lee ,
Hobyung Yoon ,
Jungje Ha  and
Yongshik Lee
Sang-Ho Lee
Affiliation:
Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea. Phone: +82 2 2123 5868
Hobyung Yoon
Affiliation:
Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea. Phone: +82 2 2123 5868
Jungje Ha
Affiliation:
Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea. Phone: +82 2 2123 5868
Yongshik Lee*
Affiliation:
Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea. Phone: +82 2 2123 5868
*
Corresponding author: Y. Lee Email: yongshik.lee@yonsei.ac.kr
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Abstract

This work demonstrates design methods that can achieve remarkable enhancement in the stopband response of microstrip coupled-line filters. The frequencies of resonance and/or the transmission zeros of a coupled-line section can be controlled by its length. Therefore, by constructing a filter with coupled lines of incommensurate lengths such that these frequencies do not overlap, substantial improvement in the stopband response can be obtained. Besides its compact structure and simple design procedure, an unprecedented performance is demonstrated experimentally in which the transmission level is maintained below −20 dB up to as high as 11.9 f0 for a third-order filter, where f0 is the center frequency.

Keywords

FiltersPassive components and circuits
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Issue 6 , December 2015 , pp. 685 - 690
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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