NDLI: Forward-wave directional coupler based on slow-wave coupled microstrip lines

Content Provider	IET Digital Library
Author	Luong, Duc Long Acri, Giuseppe Podevin, Florence Vincent, Didier Pistono, Emmanuel Serrano, Ariana Ferrari, Philippe
Abstract	This study presents the design of a forward-wave directional coupler based on slow-wave coupled microstrip lines realised in a multilayered printed circuit board technology. Thanks to the concept of slow-wave, a high difference between the even- and odd-mode phase velocities can be inherently achieved. Hence, by choosing adequate even- and odd-mode characteristic impedances close to 50 Ω, reduced-length forward couplers can be designed. As a proof of concept, a 0 dB forward coupler operating at 4.5 GHz is proposed. It exhibits a very high coupling of 0.56 dB at the centre frequency and a very large bandwidth of 43%, corresponding to 10 dB of isolation. A length miniaturisation of 84% is obtained as compared to the standard microstrip, leading to a total surface area of 0.132 λ g 2 , the smallest one reported so far.
Starting Page	2486
Ending Page	2489
Page Count	4
ISSN	17518725
Volume Number	13
e-ISSN	17518733
Issue Number	Issue 14, Nov (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/13/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.0296
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-07-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Even-mode Phase Velocities Forward-wave Directional Coupler Frequency 4.5 GHz Length Miniaturisation Loss 10 DB Microstrip Directional Couplers Microstrip Line Multilayered Printed Circuit Board Technology Odd-mode Characteristic Impedance Odd-mode Phase Velocities Printed Circuit Reduced-length Forward Couplers Slow Wave Structure Slow-wave Coupled Microstrip Line Travelling Wave Tubes Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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