| 摘要 |
A laminated balun transformer includes a third line element and a first line element which are electromagnetically coupled at a coupling portion to define a first coupler. A second line element and a fourth line element are electromagnetically coupled at a coupling portion to define a second coupler. When the length of a lambd/4 line element at a given characteristic impedance is L(0), the length of the coupling portion of the first and third line elements, which are electromagnetically coupled, is L(0)+alpha and the length of the coupling portion of the second and fourth line elements, which are electromagnetically coupled, is L(0)-beta, where alpha and beta satisfy the relationships alpha>0, beta>0, and alpha=beta or alpha<> beta.
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