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Browsing by Author "Liang, C. H."

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    Wideband high-isolation and perfect-balance microstrip rat-race coupler
    (2012-03-29)
    Chang, W. S.
    ;
    Liang, C. H.
    ;
    Chang, C. Y.
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A microstrip rat-race coupler with high isolation and perfect balance is presented. By modifying March's rat-race coupler with two additional short-circuited stubs, the isolation and the amplitude/phase balance of the proposed coupler improve significantly. The circuit can be easily fabricated on a single-layer substrate using the conventional printed circuit board process.