Patent · US Expired

Resonator filter cascade

US6859117B2 · kind B2 · utility

1Cited by

4References

11Claims

0Family size

Assignee

Tele Filter Zweigniederlassung der Dover Germany, GmbH · DE

Inventors

Guenter Martin
Bert Wall · Potsdam, DE

Key dates

Filing date	Nov 25, 2002
Grant date	Feb 22, 2005
Priority date	—
Expiry date	Dec 14, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/6433
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A resonator filter cascade has resonator structures disposed adjacent to one another and form a waveguide for acoustic surface waves, and coupling transducers. The present invention changes resonator filter cascades so that the insertion attenuation is reduced by decreasing the attenuation of cascading, without using a coupling coil. A resonator filter cascade has resonator structures having coupling transducers which transversely couple resonator filters and the coupling transducers, belonging the same transversely coupled resonator filter, are not connected with one another. Coupling transducers of different transversely coupled resonator filters are each connected with one another over a pair of electrically conducting connections.

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