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An extended ZY T‐chart for conjugately characteristic‐impedance transmission lines with active characteristic impedances
Author(s) -
Torrungrueng D.,
Chou P. Y.,
Krairiksh M.
Publication year - 2007
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.22626
Subject(s) - smith chart , chart , electrical impedance , reflection (computer programming) , reflection coefficient , lossless compression , characteristic impedance , transmission line , electrical engineering , electric power transmission , plot (graphics) , voltage , microwave , mathematical analysis , electronic engineering , mathematics , engineering , computer science , impedance matching , statistics , algorithm , telecommunications , data compression , programming language
It has been shown recently in the literature that the conjugately characteristic‐impedance transmission lines (CCITLs) implemented by periodically loaded lossless lines can exhibit active characteristic impedances (i.e., negative characteristic resistances). In this case, the magnitude of the voltage reflection coefficient is always greater than or equal to unity for passive load termination. Because of this reason, some modifications to the standard T‐chart, a graphical tool for solving CCITL problems, is necessary. The modified chart is called as an extended ZY T‐chart, where the range of plotting is always outside or on the unit circle of the voltage reflection coefficient Γ plane. It is found that the extended chart depends on the angle ϕ, the argument of the CCITL characteristic impedances, in a complicated fashion. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1961–1964, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22626