Dual-Band Branch-Line Coupler With Port Extensions

A new branch-line coupler structure with port extensions is proposed for the dual-band operation. The conventional branch-line coupler structure is adapted to the dual-band operation by inserting a transmission line section at the input ports and modifying the branch parameters. The dual-band perfor...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2010-03, Vol.58 (3), p.651-655
Main Authors: KIM, Hyunchul, LEE, Byungje, PARK, Myun-Joo
Format: Article
Language:English
Subjects:
Applied sciences
Branch-line coupler
Circuit analysis
Circuit properties
Circuit simulation
Coupling circuits
Design engineering
Distributed parameter circuits
Dual band
Electric, optical and optoelectronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Equations
Exact sciences and technology
Frequency measurement
Joining
Mathematical analysis
Microwave circuits
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Phase measurement
Ports
quadrature hybrid
Quadratures
Simulation
Theoretical study. Circuits analysis and design
Transmission line measurements
Transmission line theory
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Description
Summary:A new branch-line coupler structure with port extensions is proposed for the dual-band operation. The conventional branch-line coupler structure is adapted to the dual-band operation by inserting a transmission line section at the input ports and modifying the branch parameters. The dual-band performance of the proposed coupler is verified theoretically through the rigorous microwave circuit analysis and the exact design equations are derived in concise form. The design, simulation, and measurement results validate the dual-band capability of the proposed coupler with the same quadrature phase relation between the two band frequencies.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2010.2040342