| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein a flat and wide passing band can not be achieved even when a plurality of narrowband band-pass filters are connected in parallel. SOLUTION: The narrowband band-pass filters 11a-11g including at least a pair of filters 10a-10n for which a center frequency or a cut-off frequency is set at a frequency separated from the center frequency of a channel to both upper and lower sides by a prescribed ratio, are connected in parallel between a common signal input end 8 and a common signal output end 9. COPYRIGHT: (C)2009,JPO&INPIT
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