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Study of dual-band inline mixed coupled BPF design and two transmission zero pairs controlling mechanism

Published online by Cambridge University Press:  10 January 2017

Di Lu ,
Teng-Fei Yan  and
Xiao-Hong Tang
Di Lu*
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, Sichuan, China Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, 351 McCormick Road, Charlottesville, VA, USA
Teng-Fei Yan
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, Sichuan, China
Xiao-Hong Tang
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, Sichuan, China
*
Corresponding author: D. Lu Email: ludi888abc@hotmail.com, 201311020205@std.uestc.edu.cn
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Abstract

In this letter, a passive high-selectivity dual-band filter with two controllable transmission zero (TZ) pairs is proposed, while synthesis method and control mechanism of the two TZ pairs are investigated. Specifically, by employing the magnetic/electric mixed coupling (MEMC), source–load coupling (S–L coupling) and stepped-impedance resonators, a dual-band bandpass filter with two pairs of controllable TZs is constructed. Two controllable TZ pairs can be independently adjusted by re-modifying the associated coupling structures. To validate the synthesizability and controllability of the TZ pairs, mathematical synthesis, and EM simulations are carried out. Two demonstrative filters with identical passband performance and different central TZ distributions for GSM (0.9/1.8 GHz) are designed and measured. The analysis and experimental results show that the synthesis-controllable TZ pair (fz2, fz3) introduced by MEMC can be synthesized and controlled using inline mixed coupling synthesis, and the optimization-controllable TZ pair (fz1, fz4) because of S–L coupling is controlled by S–L coupling strength optimization procedure.

Keywords

TZ pair synthesisControllable TZ pairsMEMCS–L couplingStepped-impedance resonatorDual-band BPF
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Special Issue 7: EuCAP 2016 special issue , September 2017 , pp. 1447 - 1452
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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References

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