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Realization of transmission zeros for bandpass filter using inductive-coupled stub-loaded resonators

Published online by Cambridge University Press:  20 August 2019

Fei Cheng ,
Ping Lu Open the ORCID record for Ping Lu [Opens in a new window]  and
Kama Huang
Fei Cheng
Affiliation:
Key Laboratory of Wireless Power Transmission Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People's Republic of China
Ping Lu
Affiliation:
Key Laboratory of Wireless Power Transmission Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People's Republic of China
Kama Huang
Affiliation:
Key Laboratory of Wireless Power Transmission Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People's Republic of China
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Abstract

This article proposes a bandpass filter with three controllable transmission zeros (TZs) using three inductive-coupled stub-loaded resonators (SLRs). Different from other works, the proposed SLR can create one transmission pole and one TZ. With the TZs above the passband, high stopband rejection level is achieved. Moreover, the K-inverters are realized by short-circuit stubs between two adjacent SLRs. A general synthesis method for this kind of filter is described. For verification, a filter centered at 2.44 GHz with 0.18 GHz bandwidth is designed. The measured results show that the filter has three TZs at 3.1, 3.9, and 5 GHz. With those TZs, the filter's stopband rejection level is greatly improved.

Keywords

Transmission zeroinductive-couplingstub-loaded resonator
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 1 , February 2020 , pp. 34 - 38
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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