| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-frequency balun which maintains wide frequency band (linearity and flatness) without deterioration in the band of transmission frequency at the time of mutual conversion into unbalanced lines from balanced lines. SOLUTION: In the high-frequency balun, the unbalanced lines of unbalanced input and output and the balanced lines of balanced input and output are mutually converted, and the unbalanced lines and the balanced lines are the micro-strip lines formed of the signal line provided to one principal surface of a substrate and the grounded conductor provided on the other principal surface. This high-frequency balun is configured so that a slot line of opening line provided to the grounded conductor is formed to the other principal surface of the substrate, and the micro-strip line as the unbalanced lines is magnetically coupled and electrically short-circuited with one end used as the input/output ends, while the other end extended crossing the slot line, and the micro-strip line as the balanced lines is electro-magnetically coupled at the center thereof crossing the slot line and is provided as the input/output terminals at both ends thereof. COPYRIGHT: (C)2007,JPO&INPIT
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