NDLI: Improving isolation of slot-coupled directional couplers with weak and tight couplings

Content Provider	IET Digital Library
Author	Moradian, Mahdi
Abstract	A suitable method for improving the isolation of slot-coupled directional couplers with elliptical-shaped slot and patches is introduced. It is shown that the even- and odd-mode phase velocities depend on the width of the patches and slot of the slot-coupled directional couplers. For couplers with tight couplings, the even- and odd-mode phase velocities can be effectively equalised by cutting some parallel slots into the patches, while for couplers with weak couplings, the even- and odd-mode phase velocities can be equalised by cutting some teeth into exterior part of the slot in the common ground plane. For various slot lengths and tooth depths, various design graphs are derived by sweeping some dimensions of the coupler. On the basis of the design graphs, three couplers with tight, moderate and weak couplings are designed and simulated. The designed coupler with tight coupling is also constructed and tested. The results show that by employing the proposed method, the isolation of the slot-coupled directional couplers has improved significantly.
Starting Page	1645
Ending Page	1652
Page Count	8
ISSN	17518725
Volume Number	9
e-ISSN	17518733
Issue Number	Issue 14, Nov (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/9/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2015.0219
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2015-11-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Combinatorial Mathematics Design Graphs Directional Couplers Directive Antenna Elliptical Shaped Patches Elliptical Shaped Slot Graph Theory Ground Plane Odd Mode Phase Velocities Parallel Slot Single Antenna Slot Antenna Slot Coupled Directional Couplers Slot Lengths Tight Couplings Tooth Depths Waveguide And Microwave Transmission Line Component Weak Couplings
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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