Patent ID: 8305162
Filing Date: 2012-11-06
Classification: H03H

Abstract:
1. A surface acoustic wave resonator comprising: an IDT which is disposed on a quartz crystal substrate with an Euler angle of (−1.5°≦φ≦1.5°, 117°≦θ≦142°, 41.9°≦|ψ|≦49.57°) and which excites a surface acoustic wave in an upper mode of a stop band; and an inter-electrode-finger groove formed by recessing the quartz crystal substrate between electrode fingers of the IDT, wherein the following expression: where λ represents a wavelength of the surface acoustic wave and G represents a depth of the inter-electrode-finger groove, is satisfied and when a line occupancy of the IDT is η, the depth of the inter-electrode-finger groove G and the line occupancy η are set to satisfy the following expression: