Design of a Branch-line Microstrip Coupler Using Spirals and Step Impedance Cells for WiMAX Applications

DOI: https://doi.org/10.14500/aro.10606
Keywords: Branch line, Coupler, Insertion loss, Microstrip, Phase shift

Abstract

branch-line microstrip coupler is designed and fabricated in this paper. The proposed coupler operates at 3 GHz, which is suitable for WiMAX applications. The designed coupler has a high performance, that is, a low phase difference of 0.49°, low insertion loss, good coupling factor, and good isolation better than −30 dB. Another advantage of the designed coupler is its novel geometrical structure based on integrating the semi-circular and step impedance cells. The design process is based on introducing and analyzing an equivalent LC model to improve impedance matching and reduce losses. To verify the design process, the designed coupler is fabricated, where a good agreement between the simulation result and measurement is achieved.

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Author Biographies

Sayed M. Hosseini, Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah
Sayed Hosseini received his M.S. in Kermanshah university of Technology. His research interests include RF circuit and systems.
Abbas Rezaei, Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah
Abbas Rezaei is an Assistance Professor of Electrical Engineering in Kermanshah University of Technology. Abbas Rezaei received the B.Sc., M.Sc. and Ph.D. in Electronics Engineering from Razi University, Kerman-shah, Iran, in 2005, 2009 and 2013, respectively. His current research interests include RF and microwave circuits, computational intelligence and nanotechnology

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ARO Journal: Volume 8, No. 1 (2020)
Published
2020-02-20
How to Cite
Hosseini, S. M. and Rezaei, A. (2020) “Design of a Branch-line Microstrip Coupler Using Spirals and Step Impedance Cells for WiMAX Applications”, ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, 8(1), pp. 1-4. doi: 10.14500/aro.10606.
Issue
Vol. 8 No. 1 (2020): Issue Fourteen
Section
Articles

Copyright (c) 2020 Sayed M. Hosseini, Abbas Rezaei

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