| 摘要 |
A band pass filter for improving filtering, realizing high integration, and reducing manufacturing costs, and a duplexer having the band pass filter. The band pass filter comprises a first resonant circuit in which n first resonators are connected in series, where n is a natural number greater than 1; a second resonator circuit which faces the first resonant circuit and has m second resonators connected in series, where m is a natural number greater than 1; and a third resonant circuit in which k third resonators are connected in parallel on branching lines linking the first and second resonant circuits, where k is a natural number greater than 1. By arranging the resonators of the respective resonant circuits in the bridge structure, the filtering characteristics can be improved, the number of inductors used to adjust the resonant frequency characteristics of the resonators can be reduced, high integration can be realized and manufacture cost can be reduced.
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