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Theory and design of quarter‐wave‐like transformers implemented using conjugately characteristic‐impedance transmission lines
Author(s) -
Jongsuebchoke Itthinat,
Akkaraekthalin Prayoot,
Torrungrueng Danai
Publication year - 2016
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.30120
Subject(s) - quarter wave impedance transformer , impedance matching , transformer , microwave , engineering , electrical engineering , electronic engineering , miniaturization , transmission line , electrical impedance , electric power transmission , telecommunications , voltage , damping factor
Quarter‐wave transformers (QWTs) have been widely employed in microwave and antenna applications. In this letter, a theoretical analysis shows that properly designed conjugately characteristic‐impedance transmission lines, called quarter‐wave‐like transformers (QWLTs), can provide the impedance matching capability like standard QWTs with significantly shorter electrical length. This opens up new possibilities for miniaturization of microwave circuits and antennas. Design procedures of QWLTs are illustrated, and three case studies are discussed in this article to illustrate the QWLT concept. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2614–2619, 2016