| 摘要 |
PROBLEM TO BE SOLVED: To provide a new type surface acoustic wave resonator, where fifth-order harmonic operation is attained by utilizing a Rayleigh-type surface acoustic waves of, or the like on a piezoelectric plate, such as in-plane rotation ST cut quartz plate. SOLUTION: The surface acoustic wave resonator comprises one interdigital electrode on the piezoelectric plate, and a pair of reflectors arranged at both the sides in the propagation direction. The width dimension in the X direction of an electrode finger in the interdigital electrode is set to LT, and the line width ratio LT/PT for array period length is to be within the range of 1/2±1/12. The width dimension in the X direction in the reflector is set to LR, and the line width ratio LR/PR for array period length PR is to be within the range of 1/2±1/12. The relation for PT is PR<PT with respect to the dimension PR, and the relation between speed V of the surface acoustic waves and the operating frequency (f) is f=5V/(2PT). COPYRIGHT: (C)2007,JPO&INPIT
|
