Patent · US Expired

Electric filter employing acoustic waves

US4672339A · kind A · utility

5Cited by

3References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Peter Zibis · Munich, DE
Gerd Riha · Munich, DE
Richard Veith · Unterhaching, DE

Key dates

Filing date	May 6, 1986
Grant date	Jun 9, 1987
Priority date	—
Expiry date	May 6, 2006

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/02637
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A surface wave filter (1, 11, 21, 31, 41) having a shielding structure (13, 23, 33, 43, 53) arranged between the inter-digital, asymmetrically operating structures (2, 3), which encompasses two such sub-structures (14, 24, 34, 44, 44a) and/or (15, 25, 35, 45, 35a), which are individually connected with the finger structures of the adjacent transducer structure (2 and/or 3) that are at reference ground potential.

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