Patent · US Expired

Bulk acoustic wave filter utilizing resonators with different aspect ratios

US6909340B2 · kind B2 · utility

104Cited by

12References

12Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Robert Aigner · Winter Garden, US
Stephan Marksteiner · Putzbrunn, DE
Winfried Nessler · Munich, DE
Luder Elbrecht · Hersbruck, DE

Key dates

Filing date	May 27, 2003
Grant date	Jun 21, 2005
Priority date	—
Expiry date	May 27, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/585
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

The invention relates to bulk acoustic wave filters including at least two bulk acoustic wave resonators. Each of these resonators includes at least one first electrode, a piezoelectric layer, and a second electrode. At least two of the bulk acoustic wave resonators have effective resonator surfaces which differ in their surface form and/or surface content. The inventive design of the bulk acoustic wave resonators enables optimal suppression of interference modes without influencing the impedance level of the filter.

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