Patent ID: 9666786
Date: 2017-05-30
CPC Classifications: H01L,H03H,Y10T

Claim:
1. A bulk wave piezoelectric resonator operating at a predetermined frequency, the resonator comprising: a block of substrate with a plane face, the block of substrate having a first thickness along a normal to said plane face, and made of a first material; a resonant plate having first and second plane faces that are positioned facing each other, the resonant plate having a length, a width, and a second thickness, the resonant plate being made of a second material that is a piezoelectric material; first and second metal electrodes at least partly covering the first face and the second face of the resonant plate, respectively, the first and second metal electrodes being located at least partly facing each other, through the resonant plate; and an attachment element and/or an acoustic insulation element at an operating frequency, distinct from the block of substrate and the resonant plate, the attachment element and/or the acoustic insulation element being made of at least one third material distinct from the first and second materials, the attachment element and/or the acoustic insulation element being comprised in a group comprising a single adhesive layer, a Bragg mirror formed by a stack of layers with contrasted acoustic impedances, wherein the resonant plate is attached perpendicularly to the vicinity of the plane face of the block of substrate so that the width of the resonant plate and the first thickness of the block of substrate have a same direction, and the first material, the second material, the first thickness of the block of substrate, the length, the width, and the second thickness of the resonant plate are configured to trap bulk waves at the operating frequency of the resonator and to produce a bulk wave piezoelectric resonator of the plane-plane type in which bulk waves propagate in the direction of the thickness of the resonant plate.