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90° branch‐line Coupler with Reconfigurable Output Power Ratios
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- Authors
- Ariunzaya Batgerel, Soon-Young Eom
- Issue Date
- 2013-08
- Citation
- Microwave and Optical Technology Letters, v.55, no.8, pp.1878-1881
- ISSN
- 0895-2477
- Publisher
- John Wiley & Sons
- Language
- English
- Type
- Journal Article
- Abstract
- This letter introduces a new 90째 branch-line coupler with reconfigurable output power ratios (90째 BC-ROPR). Unlike a conventional branch-line coupler structure, each arm of the proposed 90째 BC-ROPR is defined by an asymmetrically coupled-line, and its characteristic impedance depends on the configuration of the coupled-line. The main problem that challenged this structure was unwanted loop resonance from the inner transmission lines which form a loop in a disconnected configuration. The proposed structure was designed to obtain 1:1 and 4:1 output power ratios at 3 GHz. Both the simulation and measurement results confirm that the proposed branch-line coupler successfully dealt with the loop resonance and achieved excellent performance. Copyright © 2013 Wiley Periodicals, Inc.
- KSP Keywords
- Branch-Line Coupler, Coupled line, Output power, Simulation and measurement, Transmission line, characteristic impedance, coupler structure, excellent performance, measurement results