Surface acoustic wave resonator arrangement

US12413202B2 · kind B2 · utility

Assignee

• RF360 Singapore Pte. Ltd. · SG

Inventors

• Carsten Potratz · Gerlingen, DE
• Peter Selmeier · Haag in Oberbayern, DE
• Thomas Bauer · Schrobenhausen, DE
• Helmut Klamm · Munich, DE

Key dates

• Filing date: Mar 30, 2020
• Grant date: Sep 9, 2025
• Expiry date: Jan 1, 2043

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H9/02905
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A surface acoustic wave resonator arrangement comprises a piezoelectric substrate (100) and a surface acoustic wave resonator (110) which includes an interdigital transducer (111,112) disposed on the piezoelectric substrate (100). A trench (130) is disposed within the piezoelectric substrate (100) facing the resonator (110). Trench (130) causes reflected waves (143,144) in response to waves (141,142) leaking from the surface acoustic wave resonator. Trench (130) is configured such that the reflected acoustic waves (143,144) achieve phases at the edge (115) of the resonator (110) such that the accumulated phases of all the reflected waves received at edge (115) is zero or substantially zero, thereby avoiding constructive interference of the reflected waves with the acoustic waves resonating in the resonator. Thereby undesired acoustic coupling between resonators or influence of waves reflected at edges of the piezoelectric substrate or dicing lines is reduced.