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Author: search.filters.author.Chou, P. Y.

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    A graphical tool for analysis and design of bi-characteristic-impedance transmission lines
    (2007-10-01)
    Torrungrueng, D.
    ;
    Chou, P. Y.
    ;
    Krairiksh, M.
    The bi-characteristic-impedance transmission lines (BCITLs) are generally lossy transmission lines that possess different complex characteristic impedances for waves propagating in forward and reverse directions. Because of complicated equations associated with BCITLs, a graphical tool is necessary in the analysis and design. In this article, the standard T-chart developed for conjugately characteristic-impedance transmission lines (CCITLs) is generalized to treat BCITL problems, called a generalized T-chart. It is found that the way of using this new graphical tool is similar to that of the standard T-chart. However, the magnitude of the voltage reflection coefficient associated with BCITLs may be greater than unity for some passive load terminations. An example of using a generalized T-chart is provided in this paper. © 2007 Wiley Periodicals, Inc.
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    An extended ZY T-chart for conjugately characteristic-impedance transmission lines with active characteristic impedances
    (2007-08-01)
    Torrungrueng, D.
    ;
    Chou, P. Y.
    ;
    Krairiksh, M.
    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 CCTTL 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.
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    A study of terminated hermite lossless nonuniform transmission lines using mathematica
    (2006-05-01)
    Torrungrueng, D.
    ;
    Chou, P. Y.
    ;
    Krairiksh, M.
    The terminated Hermite lossless nonuniform transmission line (HLNUTL) in the steady state is studied in this paper. Due to the complicated equations associated with HLNUTLs, numerical simulations based on Mathematica software are convenient for understanding the propagation physics of HLNUTLs. It is found that HLNUTLs have distinct characteristics compared to other types of transmission lines. For example, it is necessary to match HLNUTLs with reactive loads. The results are verified through case studies by checking the power conservation. © 2006 Wiley Periodicals, Inc.