NDLI: Improving isolation of slot-coupled directional couplers

Content Provider	IET Digital Library
Author	Moradian, M.
Abstract	A suitable method is introduced to improve the isolation of slot-coupled directional couplers. The proposed coupler consists of two trapezoidal-shaped patches that are coupled through a trapezoidal-shaped slot in a common ground plane. The inherent phase velocity differences between the even- and odd-modes of the slot-coupled directional coupler are compensated around the centre frequency of the coupler by introducing some slots to the trapezoidal-shaped patches. A design graph is derived by sweeping some dimensions of the coupler. A hatched area is also added to the design graph that indicates the appropriate coupler dimensions which lead to the equal even- and odd-mode phase velocities around the centre frequency. To demonstrate the effectiveness of the proposed coupler, an 8 dB coupler operating from 1 to 3.3 GHz is designed and constructed. The measurement results are in good agreement with the simulation results. The results show that the isolation of the designed coupler has improved significantly in comparison with the other designed coupler with no cut slots in the patches.
Starting Page	914
Ending Page	915
Page Count	2
ISSN	00135194
Volume Number	51
e-ISSN	1350911X
Issue Number	Issue 12, Jun (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/51/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2014.4477
Journal	Electronics Letters
Publisher Date	2015-05-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Common Ground Plane Coupler Dimensions Design Graph Directional Couplers Even-mode Phase Velocities Frequency 1 GHz to 3.3 GHz Hatched Area Inherent Phase Velocity Differences Odd-mode Phase Velocities Slot Line Slot-coupled Directional Couplers Trapezoidal-shaped Patches Trapezoidal-shaped Slot Waveguide And Microwave Transmission Line Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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