NDLI: High-performance tight coupling microstrip directional coupler with fragment-type compensated structure

Content Provider	IET Digital Library
Author	Wang, Lu Wang, Gang Sidén, Johan
Abstract	In this study, a design scheme for high-performance tight coupling microstrip coupler is proposed by adding a fragment-type compensated structure between two loosely coupled lines. Owing to its flexibility and adaptability, the fragment-type compensated structure can not only provide a quarter-wavelength phase shift for coupling enhancement, but also compensate the difference in the phase velocities of the even- and odd-modes for high directivity. Design of the fragment-type compensated structure can be implemented by multi-objective optimisation searching with several design objectives characterising tight coupling couplers. A high-efficiency optimisation searching strategy by using two-dimensional median filtering operator is employed to improve the efficiency of multi-objective optimisation. For demonstration, a high-performance 3-dB tight coupling directional coupler operating at 2 GHz is designed. The measurement data demonstrates a maximum directivity of 47 dB, above 25 dB directivity in a 21.5% bandwidth, a maximum variation of 0.3 dB in the coupling level and a maximum power division ratio of 0.6 dB, which indicate the overall performance better than the previously reported 3-dB couplers. In addition, a simplified theoretical analysis of the proposed coupler and full-wave simulated results are provided for better understanding of the fragment-type compensated structure.
Starting Page	1057
Ending Page	1063
Page Count	7
ISSN	17518725
Volume Number	11
e-ISSN	17518733
Issue Number	Issue 7, Jun (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/11/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0905
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-02-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Coupling Enhancement Digital Filter Directional Couplers Fragment-type Compensated Structure Frequency 2 GHz High-efficiency Optimisation High-performance Tight Coupling Loosely Coupled Line Median Filter Microstrip Couplers Microstrip Directional Coupler Multiobjective Optimisation Optimisation Optimisation Technique Phase Velocity Quarter-wavelength Phase Shift Two-dimensional Median Filtering Operator UHF Couplers UHF Filter Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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