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Wide bandwidth arbitrary phase difference branch line coupler
Author(s) -
Qamar Zeeshan,
Chan Wing Shing,
Derek Ho
Publication year - 2017
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.30716
Subject(s) - phase difference , return loss , bandwidth (computing) , phase compensation , phase (matter) , hybrid coupler , electronic engineering , electrical engineering , engineering , physics , power dividers and directional couplers , telecommunications , quantum mechanics , antenna (radio)
As a conventional branch line coupler (BLC) is limited to a phase difference of 90°, different phases have typically been realized by cascading additional phase‐shifters, which inevitably increase the circuit size. This article presents a BLC capable of achieving a combined wide bandwidth and arbitrary phase difference. This is achieved by inserting a phase compensation network directly in each of the series branch lines, which effectively modifies the electrical lengths. A prototype 60°/–120° coupler has been fabricated and experimentally characterized to achieve a 0.5‐dB magnitude imbalance, 5° phase stability, return loss better than −15 dB, and isolation better than −14 dB from 2.3 to 3.5 GHz.