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High-performance tight coupling microstrip directional coupler with fragment-type compensated structure
University of Science and Technology of China, Hefei, China.
University of Science and Technology of China, Hefei, China.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
2017 (English)In: IET Microwaves, Antennas & Propagation, ISSN 1751-8725, E-ISSN 1751-8733, Vol. 11, no 7, 1057-1063 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 11, no 7, 1057-1063 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-30994DOI: 10.1049/iet-map.2016.0905ISI: 000402296000018Scopus ID: 2-s2.0-85020066750Local ID: STCOAI: oai:DiVA.org:miun-30994DiVA: diva2:1115148
Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2017-09-04Bibliographically approved

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Sidén, Johan

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