Patent · US Active

Saw filter comprising a broadband band-stop filter

US7876179B2 · kind B2 · utility

1Cited by

13References

24Claims

0Family size

Assignee

EPCOS AG · DE

Inventors

Thomas Bauer · Schrobenhausen, DE
Matthias Jungkunz · Birkenfeld, DE

Key dates

Filing date	Oct 12, 2006
Grant date	Jan 25, 2011
Priority date	—
Expiry date	Jun 28, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/6493
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A band-stop filter is described herein. The band-stop filter includes a piezoelectric substrate and a plurality of surface wave element (SAW) impedance elements on the substrate. The band-stop filter also includes at least one series branch comprising at least one series resonator having a finger period, and a plurality of parallel branches connected electrically in parallel with the series branch, each parallel branch including at least one parallel impedance element comprising an interdigital transducer and having a finger period. The average finger period of the at least one series resonator is greater than the average finger period of the at least one parallel impedance element.

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