Patent · US Expired

Surface wave filter comprising reactance elements

US6919781B2 · kind B2 · utility

6Cited by

11References

16Claims

0Family size

Assignee

EPCOS AG · DE

Inventors

Thomas Baier · Birkenfeld, DE
Michael Unterberger · Unterhaching, DE

Key dates

Filing date	Feb 2, 2001
Grant date	Jul 19, 2005
Priority date	—
Expiry date	Feb 2, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/6483
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

Proposed is a SAW HF filter with reactance elements, which is particularly suitable for mobile radio. The filter is balanced on both sides, is electrically symmetric, and comprises a four-pole reactance series element, which can be formed from two two-pole pole reactance elements or from a four-pole reactance element, and a resonator. One bar of the respective reactance elements is connected to the input side of the filter, while the other bar is connected to the output side of the filter.

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