| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic surface wave element having an imbalance-balance conversion function and excellent in degree of balance in a passband, and also to provide a communication device using the same. SOLUTION: In the surface acoustic wave element, IDT electrode groups 21, 22, in which a plurality of first IDT electrodes 31-34 are electrically connected in the propagation direction of an acoustic surface wave, and first reflector electrodes 2, 3 are arranged on a piezoelectric substrate 1. The acoustic surface wave element is provided with an acoustic surface wave element in which one kind or more of either second IDT electrodes or second reflector electrodes 41, 42, which are not electrically connected with the first IDT electrodes 31-34, are arranged between at least two of the first IDT electrodes 31-34 in the IDT electrode groups 21, 22 as a first isolation electrode and third IDT electrodes 51, 52 which are not electrically connected with the IDT electrode groups 21, 22, are arranged between the IDT electrode groups 21, 22 and the first reflector electrodes 2, 3 as a second isolation electrode. The third IDT electrodes 51, 52 are connected with each other and made as an unbalanced input 4. Each of the IDT electrode groups 21, 22 is made as a balanced output 5 or 6. COPYRIGHT: (C)2006,JPO&NCIPI
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