Patent · US Expired

Transducer structure that operates with acoustic waves

US7042132B2 · kind B2 · utility

91Cited by

9References

15Claims

0Family size

Assignee

EPCOS AG · DE

Inventors

Thomas Bauer · Schrobenhausen, DE
Martin Bünner · Birkenfeld, DE
Andreas Detlefsen · Eichenau, DE
Dietmar Ritter · Rödental, DE

Key dates

Filing date	Mar 1, 2002
Grant date	May 9, 2006
Priority date	—
Expiry date	Jun 15, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/14555
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

For improved conformance of a filter operating with acoustic waves, a transducer structure is provided in which the separations between respectively two adjacent electrode fingers of an inter-digital transducer (IDTv) vary over the length of the transducer. The variation thereby preferably follows a continuous distribution function. Reactance filters that are provided with such filters in the serial branch show an improved electrical conformance in the transmission range.

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