Narrowband SIW-SSPP Hybrid Bandpass Filter With Compact Profile at Ka-Band

Baoqing Zhang; Zhaolin Li; Mengfa Wang; Haotian Ling; Yiming Wang; Xijian Zhang; Weihong Liu; Victor Qi; Kunfeng Chen; Gongbin Tang; Aimin Song; Yifei Zhang

doi:10.1109/ACCESS.2023.3312288

IEEE Access (Jan 2023)

Narrowband SIW-SSPP Hybrid Bandpass Filter With Compact Profile at Ka-Band

Baoqing Zhang,
Zhaolin Li,
Mengfa Wang,
Haotian Ling,
Yiming Wang,
Xijian Zhang,
Weihong Liu,
Victor Qi,
Kunfeng Chen,
Gongbin Tang,
Aimin Song,
Yifei Zhang

Affiliations

Baoqing Zhang: Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China
Zhaolin Li: Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China
Mengfa Wang: ORCiD; Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China
Haotian Ling: ORCiD; QiLu Aerospace Information Research Institute, Jinan, China
Yiming Wang: ORCiD; Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China
Xijian Zhang: ORCiD; Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China
Weihong Liu: Department of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an, China
Victor Qi: Design Center of AKMMV, Nansha, China
Kunfeng Chen: State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan, China
Gongbin Tang: State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan, China
Aimin Song: ORCiD; Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China
Yifei Zhang: ORCiD; Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, China

DOI: https://doi.org/10.1109/ACCESS.2023.3312288
Journal volume & issue: Vol. 11
pp. 98305 – 98314

Abstract

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In this paper, a narrowband bandpass filter comprising substrate integrated waveguide (SIW) and spoof surface plasmon polaritons (SSPPs) is proposed, achieving miniaturization and low insertion loss at Ka-band. SIWs and SSPPs exhibit low and high cut-off responses, respectively, which can be combined for filtering functionalities. By designing I-shaped SSPP structures with large effective length, the cut-off frequencies of SIW and SSPPs can be tailed to converge at a certain frequency for the narrowband filter, where the SIW mode functions as a quasi-evanescent mode, and the mode impedance ramps fast. A sharp funnel-shaped transition is designed to connect SIW with a large impedance and 50- $\Omega $ microstrip line for low insertion loss and a compact profile. In addition, no transitional SSPP structures are desired in the proposed devices, which further shortens the profile dimension. To verify our design, a hybrid filter at 30 GHz is fabricated and characterized. The measured insertion loss is as low as 1.5 dB, and the 3-dB bandwidth is as narrow as 3%, which shows good consistency with the simulation. The proposed SIW-SSPP device has a low profile of $0.70\,\,\lambda \times 0.38\,\,\lambda $ and may find important applications in frequency division multiplexing.

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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