Patent ID: 9088263
Filing Date: 2015-07-21
Classification: H03B,H03H

Abstract:
1. A surface acoustic wave resonator comprising: an IDT that is disposed on a quartz crystal substrate of Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, and 42.79°≦|ψ|≦49.57°) and excites a surface acoustic wave resonant in an upper part of a stop-band of the IDT; inter-electrode finger grooves that are acquired by depressing the substrate located between electrode fingers configuring the IDT; and one pair of reflection units that are arranged so as allow the IDT to be disposed therebetween in a propagation direction of the surface acoustic wave and reflect the surface acoustic wave, wherein, in a case where a wavelength of the surface acoustic wave is λ, and a depth of the inter-electrode finger grooves is G, 0.01λ≦G is satisfied, wherein, in a case where a line occupancy ratio of the IDT is η, the depth G of the inter-electrode finger grooves and the line occupancy ratio η satisfy one of the following relationships: