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Generalized dual-band branch-line coupler with arbitrary power division ratios

Published online by Cambridge University Press:  26 June 2015

Seyed-Ali Malakooti ,
Mohsen Hayati ,
Veria Fahimi  and
Behnam Afzali
Seyed-Ali Malakooti
Affiliation:
Electrical Engineering Department, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
Mohsen Hayati*
Affiliation:
Electrical Engineering Department, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
Veria Fahimi
Affiliation:
Electrical Engineering Department, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
Behnam Afzali
Affiliation:
Department of Electrical Engineering, Technical and Vocational College of Kermanshah, Technical and Vocational University, Kermanshah, Iran
*
Corresponding author: M. Hayati Email: [email protected]
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Abstract

In this paper, a novel design of generalized dual-band quadrature hybrid with arbitrary power division ratios is presented and investigated. This coupler has a simple structure and can cover a wide range of power division ratios at the two designated frequencies. Exact closed-form equations are derived based on the even–odd-mode analysis method. The proposed structure offers some special features, encompassing: (1) a generalized structure of some recently published papers; (2) isolation in vertical and horizontal directions in the two-dimensional structure; (3) the same sign of the output phase difference for the structure with horizontal isolation and the opposite sign for the structure with vertical isolation; (4) large power division ratios for both vertical and horizontal isolation conditions; (5) large frequency band ratio for both vertical and horizontal isolation conditions; (6) capability of the bandwidth improvement by exploiting coupled lines with small coupling coefficient. For demonstration, a microstrip implementation of a 16:1 dual-band coupler working on 2.45/5.8 GHz is developed. Consistency between simulation and measurement results justifies the proposed design method and its equations.

Keywords

Passive components and circuitsCircuit design and applications
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 7 , November 2016 , pp. 1051 - 1059
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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