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90° branch‐line Coupler with Reconfigurable Output Power Ratios
Author(s) -
Batgerel Ariunzaya,
Eom SoonYoung
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27703
Subject(s) - hybrid coupler , loop (graph theory) , rat race coupler , microwave , line (geometry) , power (physics) , transmission line , electric power transmission , engineering , topology (electrical circuits) , resonance (particle physics) , power dividers and directional couplers , electrical engineering , physics , optics , telecommunications , mathematics , geometry , atomic physics , combinatorics , quantum mechanics
This letter introduces a new 90° branch‐line coupler with reconfigurable output power ratios (90° BC‐ROPR). Unlike a conventional branch‐line coupler structure, each arm of the proposed 90° 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. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1878–1881, 2013