| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter device capable of acquiring a large attenuation amount in a wide frequency range of a band lower than a pass-band. SOLUTION: The filter device has a laminate 1 of dielectric layers 1a-1e sandwiched by opposite grounding electrodes 2a, 2b, the laminate 1 having: first-fourth resonant electrodes 3-6 each having an opening end and a short-circuit end; fifth-eighth resonant electrodes 7-10 laterally disposed so that their opening end and short-circuit end may be opposite to those of the first-fourth resonant electrodes 3-6 each having an opening end and a short-circuit end; an input terminal electrode 11 connected to the first resonant electrode 3; an output terminal electrode 12 connected to the fifth resonant electrode 7; and a connection conductor 13 for connecting the fourth resonant electrode 6 to the eighth resonant electrode 10. The filter device can acquire large attenuation amount in a wide frequency range of a band lower than the pass-band. COPYRIGHT: (C)2009,JPO&INPIT
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