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Miniaturized substrate-integrated coaxial line bandpass filter with improved upper stopband

Published online by Cambridge University Press:  30 January 2017

Yunlong Lu ,
Yi Wang ,
Taijun Liu ,
Bo Yu  and
Kai Li
Yunlong Lu*
Affiliation:
Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, Zhejiang 315211, China. Phone: +86-18758327855
Yi Wang
Affiliation:
Department of Electrical, Electronic and Computer Engineering, University of Greenwich, ME4 4TB Kent, UK
Taijun Liu
Affiliation:
Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, Zhejiang 315211, China. Phone: +86-18758327855
Bo Yu
Affiliation:
Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Kai Li
Affiliation:
Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
*
Corresponding author: Y. Lu Email: luyunlong@nbu.edu.cn
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Abstract

A miniaturized substrate-integrated coaxial line (SICL) bandpass filter with improved upper stopband using asymmetrical spiral stub-loaded resonators is presented in this paper. Owing to the space-filling feature of the spiral structure, the size of the proposed filter is significantly reduced. A theoretical analysis is carried out to examine the resonance property of the proposed resonator. It is found that the frequency ratios of the second and third harmonics to the fundamental frequency can be extended to 2.86 and 4.4. Benefiting from the circuit structure and SICL technology, the designed filter has a small size, wide stopband, low crosstalk, and high-density integration ability. The measured results show that the proposed filter, with dimensions of 0.051λ0 × 0.044λ0, operates at 1.056 GHz and the 20-dB rejection band is extended to 3.94f0.

Keywords

MiniaturizedSubstrate-integrated coaxial lineBandpass filterWide stopband
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Special Issue 7: EuCAP 2016 special issue , September 2017 , pp. 1441 - 1445
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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References

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