| 摘要 |
PROBLEM TO BE SOLVED: To easily reduce spurious in a band-pass filter having a plurality of resonators. SOLUTION: The band-pass filter 1 has an input terminal 2, an output terminal 3, and three resonators 4, 5, 6. The resonators 4, 6 are connected to the input and output terminals 2, 3, respectively. The resonator 5 is arranged between the resonators 4, 6. The adjacent resonators 4, 5 are subjected to inductive coupling. The adjacent resonator 5, 6 are also subjected to the inductive coupling. A connection section 41 includes an inductor 7 and a capacitor 17 connected in series and connects the resonator 4 to the resonator 5. A connection section 42 includes a capacitor 18 and an inductor 8 connected in series and connects the resonator 5 to the resonator 6. COPYRIGHT: (C)2008,JPO&INPIT
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