| 摘要 |
PROBLEM TO BE SOLVED: To minimize a characteristic change from a state of before connection in the case that a plurality of surface acoustic wave filter elements are formed in one chip and they are connected in common at their input terminals or output terminals. SOLUTION: First and second filters F1, F2 whose center frequencies f1, f2 of pass bands different from each other are formed in one chip 1 that acts as a band pass filter. Input terminals Tin1, Tin3 of the chip 1 are connected in common at a connecting point A. A 1-port type surface acoustic wave resonator Rs1 is connected in series between the connecting point A and a surface acoustic wave resonator filter 10. A 1-port type surface acoustic wave resonator Rs2 is connected in series between the connecting point A and a surface acoustic wave resonator filter 20.
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