Dual-Band Bandpass Filter and Filtering Power Divider With Ultra-Wide Upper Stopband Using Hybrid Microstrip/DGS Dual-Resonance Cells

Yunbo Rao; Huizhen Jenny Qian; Bingzheng Yang; Roberto Gomez-Garcia; Xun Luo

doi:10.1109/ACCESS.2020.2970209

IEEE Access (Jan 2020)

Dual-Band Bandpass Filter and Filtering Power Divider With Ultra-Wide Upper Stopband Using Hybrid Microstrip/DGS Dual-Resonance Cells

Yunbo Rao,
Huizhen Jenny Qian,
Bingzheng Yang,
Roberto Gomez-Garcia,
Xun Luo

Affiliations

Yunbo Rao: ORCiD; State Key Laboratory of Electronic Thin Films and Integrated Devices, Center for Integrated Circuits, University of Electronic Science and Technology of China, Chengdu, China
Huizhen Jenny Qian: State Key Laboratory of Electronic Thin Films and Integrated Devices, Center for Integrated Circuits, University of Electronic Science and Technology of China, Chengdu, China
Bingzheng Yang: State Key Laboratory of Electronic Thin Films and Integrated Devices, Center for Integrated Circuits, University of Electronic Science and Technology of China, Chengdu, China
Roberto Gomez-Garcia: ORCiD; State Key Laboratory of Electronic Thin Films and Integrated Devices, Center for Integrated Circuits, University of Electronic Science and Technology of China, Chengdu, China
Xun Luo: ORCiD; State Key Laboratory of Electronic Thin Films and Integrated Devices, Center for Integrated Circuits, University of Electronic Science and Technology of China, Chengdu, China

DOI: https://doi.org/10.1109/ACCESS.2020.2970209
Journal volume & issue: Vol. 8
pp. 23624 – 23637

Abstract

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In this paper, two types (i.e., type-A and type-B) of hybrid microstrip/defected ground structure (DGS) cells are proposed for passive circuit implementation with ultra-wide stopband. Both cells consist of the stepped-impedance DGS and embedded folded slotline on the ground, which could obtain the dual-resonances. In type-A cell, a microstrip T-stub on the top side is introduced, which can not only allocate a strong coupling to the DGS with slotline on the bottom side, but also act as the input/output port. To finely adjust the dual-resonances of the type-B cell, a grounded microstrip patch is used. Meanwhile, such compact cells could feature an ultra-wide upper stopband, due to their own slow-wave effect. Based on the aforementioned hybrid microstrip/DGS cells, two dual-band bandpass filters (BPFs) and a dual-band filtering power divider (FPD) are proposed and fabricated. Measured and simulated results are in a fairly-close agreement. Both dual-band BPFs exhibit the ultra-wide upper stopband, which extends up to 40 GHz with a high rejection level about 30 dB. Besides, the dual-band FPD has merits of more than 18.7 dB of in-band isolation and 28 dB stopband rejection levels up to 40 GHz.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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