| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave resonator filter which is suitable for a balanced terminal as one or both of 1st and 2nd terminals as input/output terminals. SOLUTION: This surface acoustic wave resonator filter is constituted by providing a 1st interdigital electrode 1, 2nd and 3rd interdigital electrodes 2 and 3 on both its sides, and a reflector 4 further on both their sides on a piezoelectric body substrate 5, connecting a 1st terminal 6 to the 1st interdigital electrode 1 as an unbalanced terminal, and connecting 2nd terminals as balanced terminal, so that the 2nd and 3rd interdigital terminals 2 and 3 have opposite polarities. Furthermore, the 1st terminal 6 is connected to both the sides of the 1st interdigital electrode which also are balanced terminals.
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