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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
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: [email protected]

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.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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