| 摘要 |
PROBLEM TO BE SOLVED: To obtain wide pass-band characteristics and steep attenuation characteristics nearby a passing band. SOLUTION: A band-pass filter has distributed constant lines 5a, 5b, and 5c connecting an input transmission line 3 and an output transmission line 4 formed on a dielectric substrate 2, and resonators having tap parts 6a, 6b, 6c, and 6d comprising distributed constant lines connected to the distributed constant lines 5a, 5b and 5c at ends, and stub parts 7a, 7b, 7c, and 7d comprising distributed constant lines connected to the tap parts 6a, 6b, 6c, and 6d in areas other than the ends, and the four resonators are connected (coupled) in multiple stages between the input transmission line 3 and output transmission line 4 by the distributed constant lines 5a, 5b, and 5c. COPYRIGHT: (C)2007,JPO&INPIT
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