| 摘要 |
PROBLEM TO BE SOLVED: To provide a high pass filter that is provided with a trap circuit comprising a parallel resonance circuit to produce a frequency resonated in the vicinity of a cut-off frequency so as to remarkably reduce the attenuation characteristic in the vicinity of the cut-off frequency of its pass band. SOLUTION: First and second channel-shaped strip line flat plates respectively provided with: one and the other parallel parts 4(1), 5(1), and 4(2), 5(2); and connection parts 4(3), 5(3) for connecting other end of the parallel parts, are arranged to different dielectric layers of a multilayered board in a way that the connection parts 4(3), 5(3) are arranged in directions opposite to each other. The parallel parts 4(1), 5(2) and the parallel parts 4(2), 5(1) corresponding to each other are arranged opposite to each other. A signal input terminal is formed to one end of the parallel part 4(1) of the first strip line and a signal output terminal is formed to one end of the parallel part 5(1) of the second strip line respectively, and the other end of the parallel part 4(2) and the other end of the parallel part 5(2) are conductively connected to a ground conductor through a through-hole provided to the multilayered board. COPYRIGHT: (C)2007,JPO&INPIT
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