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Miniaturized branch-line coupler based on slow-wave microstrip lines

Published online by Cambridge University Press:  22 August 2018

H. Alhalabi ,
H. Issa Open the ORCID record for H. Issa [Opens in a new window] ,
E. Pistono ,
D. Kaddour ,
F. Podevin ,
A. Baheti ,
S. Abouchahine  and
P. Ferrari
H. Alhalabi
Affiliation:
Beirut Arab University, Debbieh, Lebanon
H. Issa*
Affiliation:
Beirut Arab University, Debbieh, Lebanon
E. Pistono
Affiliation:
Univ. Grenoble Alpes, Grenoble INP, CNRS, RFIC-lab, F-38000 Grenoble, France
D. Kaddour
Affiliation:
Univ. Grenoble Alpes, Grenoble INP, CNRS, LCIS-lab, 26000 Valence, France
F. Podevin
Affiliation:
Univ. Grenoble Alpes, Grenoble INP, CNRS, RFIC-lab, F-38000 Grenoble, France
A. Baheti
Affiliation:
Alten GmbH
S. Abouchahine
Affiliation:
Beirut Arab University, Debbieh, Lebanon
P. Ferrari
Affiliation:
Univ. Grenoble Alpes, Grenoble INP, CNRS, RFIC-lab, F-38000 Grenoble, France
*
Author for correspondence: H. Issa, E-mail: h.issa@bau.edu.lb
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Abstract

This paper presents a miniaturized 3-dB branch-line coupler based on slow-wave microstrip transmission lines. The miniaturized coupler operating at 2.45 GHz is designed and implemented on a double-layer printed circuit board substrate with blind metallic vias embedded in the lower substrate layer providing the slow-wave effect. Based on this concept, a 43% size miniaturization is achieved as compared with a classical microstrip branch-line coupler prototype. The measured S parameters present a return loss of 25.5 dB and an average insertion loss equal to 0.05 dB at the operating frequency.

Keywords

Branch-line couplerEM field theorypassive components and circuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Issue 10 , December 2018 , pp. 1103 - 1106
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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