Patent · US Expired

Acoustic wave transducer with transverse mode suppression

US7538637B2 · kind B2 · utility

7Cited by

4References

8Claims

0Family size

Assignee

EPCOS AG · DE

Inventors

Markus Mayer · Taufkirchen, DE
Ralph Stommer · Neubiberg, DE
Günter Kovacs · Birkenfeld, DE
Andreas Bergmann · Berlin, DE
Pasi Tikka · Munich, DE

Key dates

Filing date	Jun 16, 2004
Grant date	May 26, 2009
Priority date	—
Expiry date	Jan 9, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/1455
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An acoustic wave transducer includes an acoustic track having electrode fingers for different electrodes. The electrode fingers engage to form exciting finger pairs. The acoustic track also includes marginal areas and an excitation area. The electrode fingers engage in the excitation area. The marginal areas and the excitation area are located along a transverse direction of the acoustic wave transducer. A longitudinal phase speed of an acoustic wave in the acoustic track is less in a marginal area than in the excitation area, and the acoustic wave is excitable and has a transversal basic mode. The following applies in the transversal basic mode for a wave number ky: (ky)2>0 in a marginal area, and (ky)2<0 in an exterior area outside the acoustic track. ky is smaller in the excitation area than in the marginal areas and in the exterior area.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.