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Bandwidth-enhanced lumped-element absorptive bandstop filter topology and its application to LTCC bandstop filter design

Published online by Cambridge University Press:  27 August 2014

Juseop Lee
Affiliation:
Department of Computer and Communications Engineering, Korea University, Seoul 136-701, Republic of Korea. Phone: +82 2 3290 4848
Byungguk Kim
Affiliation:
School of Electrical and computer Engineering, Purdue University, West Lafayette, IN 47907, USA
Kangho Lee
Affiliation:
Department of Computer and Radio Communications Engineering, Korea University, Seoul 136-701, Republic of Korea
William J. Chappell
Affiliation:
School of Electrical and computer Engineering, Purdue University, West Lafayette, IN 47907, USA
Corresponding
E-mail address:

Abstract

In this paper, we show a second-order (four-resonator) absorptive bandstop filter circuit topology which gives a larger bandwidth compared to a first-order topology. Due to the absorptive characteristic, it creates a large attenuation at the center frequency using low-Q resonators. Since low-Q resonators can be used in generating a large attenuation, small-size resonators can be employed in bandstop filter design. Analytic design equations are provided so that a higher-order absorptive bandstop filter can be designed analytically. It is also shown that the second-order filter topology exhibits a better frequency selectivity having a same bandwidth. The proposed filter topology has been applied to a design of a miniaturized low-temperature co-fired ceramic bandstop filter with low-Q resonators. The Q-factor of the lumped-element resonators has been chosen to be 5 for demonstration.

Type
Research Paper
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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Bandwidth-enhanced lumped-element absorptive bandstop filter topology and its application to LTCC bandstop filter design
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