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A size-miniaturized bandpass filter with selectivity-enhanced and high harmonic suppression performance

Published online by Cambridge University Press:  01 June 2017

Tao Huang  and
Zhenhai Shao
Tao Huang
Affiliation:
School of Communication and Information Engineering, University of Electronics Science and Technology of China, Chengdu 611731, China
Zhenhai Shao*
Affiliation:
School of Communication and Information Engineering, University of Electronics Science and Technology of China, Chengdu 611731, China
*
Corresponding author: Z. Shao Email: shao_zh@uestc.edu.cn
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Abstract

In this paper, a novel microstrip bandpass filter is proposed to enhance sideband selectivity, suppress harmonic frequency up to three-order as well as to keep a miniaturized size for frequency synthesizer application. The filter is constructed by four λ/4 folded stepped-impedance resonators (FSIRs) and two λ/2 stepped-impedance resonators at input/output ports to create three pairs of coupling paths and then to produce three cross-coupling transmission zeros (TZs) as well as to achieve a size miniaturization with 96% reduction compared with the conventional filter. By adding a common grounded metallized via hole among four λ/4 FSIRs of the filter, additional four mixed electric and magnetic coupling paths are set to generate extra four TZs. With these seven TZs, the proposed filter achieves a good sideband selectivity and harmonic suppression. Finally, the filter is designed, fabricated, and measured, its measured results are in well agreement with its simulated results.

Keywords

FiltersPassive Components and Circuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 9 , November 2017 , pp. 1809 - 1815
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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References

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