Planar Dual-Band Branch-Line Coupler With Large Frequency Ratio

Lei Xia; Jia-Lin Li; Baidenger Agyekum Twumasi; Peng Liu; Shan-Shan Gao

doi:10.1109/ACCESS.2020.2974235

IEEE Access (Jan 2020)

Planar Dual-Band Branch-Line Coupler With Large Frequency Ratio

Lei Xia,
Jia-Lin Li,
Baidenger Agyekum Twumasi,
Peng Liu,
Shan-Shan Gao

Affiliations

Lei Xia: ORCiD; School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China
Jia-Lin Li: School of Physics, University of Electronic Science and Technology of China, Chengdu, China
Baidenger Agyekum Twumasi: ORCiD; School of Physics, University of Electronic Science and Technology of China, Chengdu, China
Peng Liu: ORCiD; School of Physics, University of Electronic Science and Technology of China, Chengdu, China
Shan-Shan Gao: School of Electronic and Information Engineering, Chengdu University, Chengdu, China

DOI: https://doi.org/10.1109/ACCESS.2020.2974235
Journal volume & issue: Vol. 8
pp. 33188 – 33195

Abstract

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This work presents a novel planar branch-line coupler topology developed for dual-band operation using an E-shaped impedance transformer network to supplant the conventional microstrip line. Explicit closed-form design equations for dual-band operation are derived using the ABCD matrices. The studied coupler features a large dual-band frequency ratio with a compact size. A prototype coupler centered at 1 and 8 GHz is first presented and experimentally examined to demonstrate the large frequency ratio. Further, another prototype coupler centered at 2.4 and 5.2 GHz for potential WLAN applications is also developed and experimentally characterized. Measurements and simulations for both prototype couplers show good performance within the studied dual-band frequencies.

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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