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A compact dual band branch line coupler with arbitrary power division ratio
Author(s) -
Kim Kwisoo,
Lim Jongsik,
Kim Kwangsoo,
Ahn Dal
Publication year - 2010
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.25258
Subject(s) - multi band device , microwave , electrical engineering , division (mathematics) , transmission line , electric power transmission , line (geometry) , power dividers and directional couplers , electronic circuit , electrical impedance , rat race coupler , wilkinson power divider , topology (electrical circuits) , engineering , hybrid coupler , physics , electronic engineering , telecommunications , mathematics , frequency divider , antenna (radio) , geometry , arithmetic
This article presents a compact dual‐band (DB) branch line coupler (BLC) with different power division ratio at arbitrary two frequency bands. In this article, we add a technique to satisfy transmission lines of conventional BLC with different impedance at two bands, while they are transformed to π‐type equivalent circuits. The design equations for DB BLC with different coupling coefficients at two bands are given. Furthermore, folded shape of shunt lines make about 77% circuit dimension comparing to conventional single‐band BLC. A DB BLC operating different power division ratio at 0.9 and 2.0 GHz is demonstrated in excellent agreement with both circuit simulation and experimental results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1476–1480, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25258