| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of the coupling coefficients between the resonators differing from each other, when three resonators are coupled electromagnetically into a band-pass filter, so that a circuit design and a structural design become complicated for obtaining the prescribed characteristics, because coil conductor patterns, each having less than one turn of a conductor between insulator layers, are connected in a spiral to form a coil. SOLUTION: Insulator layers and coil conductor patterns are laminated, and the coil conductor patterns between the insulator layers are connected to form a coil inside the laminate. The coil conductor patterns are formed into an endless loop.
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