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A miniaturized tri-band bandpass microstrip filter using multiple resonators with sharp skirts

Published online by Cambridge University Press:  24 September 2020

Chenhao Wang ,
Xiaoli Xi Open the ORCID record for Xiaoli Xi [Opens in a new window] ,
Yuchen Zhao  and
Xiaomin Shi
Chenhao Wang
Affiliation:
Electronic Engineering Department, Xi'an University of Technology, Xi'an, China
Xiaoli Xi*
Affiliation:
Electronic Engineering Department, Xi'an University of Technology, Xi'an, China
Yuchen Zhao
Affiliation:
Electronic Engineering Department, Xi'an University of Technology, Xi'an, China
Xiaomin Shi
Affiliation:
Communication Engineering Department, Xi'an Shiyou University, Xi'an, China
*
Author for correspondence: Xiao-li Xi, E-mail: xixiaoli@xaut.edu.cn
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Abstract

In this paper, a miniaturized tri-band bandpass microstrip filter using stub loaded rectangular ring resonator (SLRRR)，shorted stub loaded stepped impedance resonators (SSLSIR), and stepped impedance resonators (SIR) with sharp skirts is presented. Two SSLSIRs are embedded paralleled inside SLRRR to generate a quasi-elliptic response at second and third passband. The odd-even fundamental resonant mode and first high-order resonant mode of the SIRs are exploited to generate tri-band response. Three bandwidths can be controlled independently due to different signal paths. Extra transmission zeros are introduced by the configuration of 0° feed structure. Sharp skirts are achieved at the upper edge of each passband by λg/4 lines which are loaded at the I/O ports. An example of the proposed tri-band filter operating at 2.76 GHz/5.7 GHz/7.63 GHz for TDD-LTE/WLAN/VSAT applications is implemented and fabricated. The simulation and measurement show a good agreement.

Keywords

Tri-band filterminiaturizedstub loaded rectangular ring resonator (SLRRR)shorted stub loaded stepped impedance resonators(SSLSIR)
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 5 , June 2021 , pp. 430 - 434
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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