Patent ID: 8368474
Filing Date: 2013-02-05
Classification: H03B

Abstract:
1. A surface acoustic wave oscillator comprising: a first surface acoustic wave element and a second surface acoustic wave element each including interdigital electrodes and a reflector formed on a piezoelectric material, the interdigital electrodes having a plurality of finger portions, the reflector having a plurality of reflector-electrodes; a first oscillating circuit part forming an oscillating loop including the first acoustic wave element as a component; and a second oscillating circuit part forming an oscillating loop including the second acoustic wave element as a component, wherein the first oscillating circuit part and the second oscillating circuit part are configured to have an identical admittance property, the first surface acoustic wave element and the second surface acoustic wave element are configured that an electrode pitch of the finger portions and reflector-electrodes is identical between the first surface acoustic wave element and the second surface acoustic wave element, and an amplitude of a curve of an admittance property indicating a relation between a frequency and an admittance value is different between the first surface acoustic wave element and the second surface acoustic wave element, wherein a first intersection point between the admittance property of the first surface acoustic wave element and the admittance property of the first oscillating circuit part and a second intersection point between the admittance property of the second surface acoustic wave element and the admittance property of the second oscillating circuit part are at different frequencies, and an interdigitated length of at least a part of the finger portions and reflector-electrodes is different between the first surface acoustic wave element and the second surface acoustic wave element.