Patent · US Expired

Converter for surface waves with improved suppression of interfering excitation

US7170372B2 · kind B2 · utility

8Cited by

9References

32Claims

0Family size

Assignee

EPCOS AG · DE

Inventors

Werner Ruile · Birkenfeld, DE
Thomas Bauer · Schrobenhausen, DE
Michael Jakob · Birkenfeld, DE
Ulrike Rösler · Hebertshausen, DE

Key dates

Filing date	May 21, 2002
Grant date	Jan 30, 2007
Priority date	—
Expiry date	Nov 25, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/14547
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An electro-acoustic transducer for a component operating with surface waves, in particular for a surface wave filter, in which, to suppress interfering excitation ensuing in the gap region adjacent an end of a finger, a variation of the gaps is implemented with regard to at least one feature selected from transversal arrangement, size and shape. Due to the slight dimension change of the position of the gap in comparison to the finger length, the desired primary excitation in the transducer remains approximately unchanged, however the interfering excitation is displaced or divided, and made ineffectual.

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