| 摘要 |
PROBLEM TO BE SOLVED: To provide a SAW (surface acoustic wave) filter having several kinds of applications regardless of one kind of a SAW filter. SOLUTION: This SAW filter 100 has SAW filter elements 10 and 20 internally. Input-output terminals 12 and 24 of the elements 10 and 20, output-input terminals 16 and 28 are connected electrically to 1st, 2nd, 3rd and 4th filter terminals 40, 42, 44 and 46 respectively, input-output terminals 14 and 22 are both connected electrically to a 1st common filter terminal 48, and output-input terminals 18 and 26 are both connected electrically to a 2nd common filter terminal 50 respectively. The filter 100 can optionally decide an input side and an output side, and also, whichever is selected as an input side, it can output a signal of a frequency band that passes through the 1st and 2nd SAW filter elements.
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