Patent · US Expired

Dual-mode surface acoustic wave filter with split input/output converters determining impedance

US6353372B1 · kind B1 · utility

30Cited by

7References

8Claims

0Family size

Assignee

EPCOS AG · DE

Inventors

Thomas Baier · Birkenfeld, DE
Georg Strauss · Lechenich, DE

Key dates

Filing date	Dec 9, 1999
Grant date	Mar 5, 2002
Priority date	—
Expiry date	Dec 9, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/6426
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A dual-mode surface acoustic wave filter that can optionally be operated balanced or unbalanced, having tracks which are coupled to one another via coupling converters. The filter has interdigital converters for each track which are disposed within reflectors and act as input and output converters. The impedance of the input and/or output converters of the filter is determined by omission or overlap weighting and/or by splitting the input and output converters into a plurality of individual converters. At least some of the individual converters are connected in series, for each acoustic track.

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