| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a band-pass filter while allowing it to have desired characteristics. SOLUTION: A ground conductor layer is formed on one surface of a laminate substrate on which a plurality of dielectric layers and conductor layers are laminated, and resonant pattern conductor layers each having resonant electrode patterns 161a, 161b each of which one end is a short circuit end connected to the conductor layer and the other end is an open end are formed via the dielectric layer so as to oppose the conductor layer. The open end side of the resonant electrode is connected to input and output terminals TPa and TPb, and signals of desired frequency bands among signals inputted into one input and output terminal TPa are allowed to pass and outputted from the other input and output terminal TPb. A plurality of characteristic correcting patterns 182 projected like stubs or T shapes from the ground pattern 181 connected to the ground conductor layer are formed on the resonant electrode patterns 161a, 161b via the dielectric layer, and the pattern 182 is selectively separated from the ground pattern 181 so that the filter may have the desired characteristics. COPYRIGHT: (C)2006,JPO&NCIPI
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