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Design of High-Directivity Wideband Microstrip Directional Coupler With Fragment-Type Structure
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
Univ Sci & Technol China, Dept Elect Engn & Informat Sci, Hefei 230027, Peoples R China.
Univ Sci & Technol China, Dept Elect Engn & Informat Sci, Hefei 230027, Peoples R China.
2015 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 63, no 12, p. 3962-3970Article in journal (Refereed) Published
Abstract [en]

A novel design for a microstrip wideband directional coupler is proposedby using fragment-type structures. The use of a fragment-type structuremay provide satisfactory flexibility and excellent performance. For agiven design space, a fragment-type wideband coupler can be designed byfirst gridding the space into fragment cells and then metallizing thefragment cells selected by a multi-objective optimization searchingalgorithm, such as a multi-objective evolutionary algorithm based ondecomposition combined with enhanced genetic operators. Fordemonstration, a 20-dB wideband microstrip directional coupler isdesigned and verified by test. A 45% bandwidth centered at 2 GHz hasbeen measured in terms of maximum variation of 0.5 dB in the 20-dBcoupling level. In the operation band, the designed coupler hasdirectivity above 37 dB, and a maximum directivity of 48 dB at 2 GHz. Inaddition, some technique aspects related to multi-objective optimizationsearching, such as effects of design space, control of coupling level,and efficiency consideration for optimization searching, are furtherdiscussed. Fragment-type structures may also be used to designhigh-performance wideband directional couplers of tight coupling level.

Place, publisher, year, edition, pages
2015. Vol. 63, no 12, p. 3962-3970
Keyword [en]
Fragment-type structure, microstrip directional coupler wideband design, multi-objective evolutionary algorithm based on decomposition combined with enhanced genetic operators (MOEA/D-GO)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-26837DOI: 10.1109/TMTT.2015.2490671ISI: 000366318000013Scopus ID: 2-s2.0-84959466811Local ID: STCOAI: oai:DiVA.org:miun-26837DiVA: diva2:891622
Available from: 2016-01-07 Created: 2016-01-07 Last updated: 2017-12-01Bibliographically approved

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Sidén, Johan

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