| 摘要 |
In order to provide a transducer suitable for an anisotropic substrate having the NSPUDT property, on the anisotropic piezoelectric substrate being cut to have the NSPUDT property, there is formed a transducer structure having an exciting electrode structure (21) and a reflector structure (22). When lambd is a wavelength of a fundamental surface acoustic wave, said exciting electrode structure (21) includes a positive electrode (23) having a plurality of electrode fingers arranged at a pitch lambd and a negative electrode (24) having at least one electrode finger interdigitally arranged between said electrode fingers of the positive electrode with a center distance of lambd/2. The reflector transducer (22) includes a plurality of electrode fingers arranged with a center distance of lambd/2, and a distance Lg between said exciting electrode structure (21) and the reflector structure (22) is set to Lg=(2n+1)lambd/4 (n being a positive integer).
|
