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Bandwidth improvement of rat‐race couplers having left‐handed transmission‐line sections
Author(s) -
Sorocki Jakub,
Piekarz Ilona,
Wincza Krzysztof,
Gruszczynski Slawomir
Publication year - 2014
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20766
Subject(s) - hybrid coupler , broadband , rat race coupler , narrowband , transformer , center frequency , transmission line , electrical engineering , microwave , bandwidth (computing) , left handed , electrical impedance , engineering , physics , acoustics , power dividers and directional couplers , electronic engineering , telecommunications , optics , voltage , band pass filter
A novel broadband rat‐race coupler has been investigated. The coupler utilizes an artificial left‐handed transmission line section for broadband phase response realization. Moreover, a narrowband model of left‐handed section has been shown to prove the couplers equivalent circuit at the center frequency. To broaden the operational bandwidth multisection quarter‐wave transformers have been proposed. The exemplary rat‐race coupler with two‐section impedance transformers has been designed and manufactured. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:341–347, 2014.