Electroacoustic transducer for a surface wave operating component

US7449812B2 · kind B2 · utility

Assignee

• EPCOS AG · DE

Inventors

• Markus Hauser · Feldafing, DE
• Ulrike Roesler · Hebertshausen, DE
• Werner Ruile · Birkenfeld, DE

Key dates

• Filing date: Dec 16, 2003
• Grant date: Nov 11, 2008
• Expiry date: Mar 25, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H9/14517
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

An electroacoustic transducer includes a first electrode having first fingers connected to a first bus bar, and a second electrode having second fingers connected to a second bus bar. The first and second fingers interdigitate and terminate at ends. The ends of the first and second fingers abut gaps between the first and second electrodes. An acoustic wave of wavelength λ is excitable at a resonant frequency. The acoustic wave has a longitudinal and a transverse excitation profile and a longitudinal and a transverse energy density profile, where the longitudinal excitation profile is approximately constant and different from the longitudinal energy density profile, and the transverse excitation profile substantially corresponds to the transverse energy density profile. Transverse positions of the gaps relative to the first and second bus bars vary to substantially correspond to the transverse excitation profile across the gaps.