Patent · US Expired

Piezoelectric resonator apparatus with acoustic reflector

US6841922B2 · kind B2 · utility

102Cited by

4References

9Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Robert Aigner · Winter Garden, US
Lueder Elbrecht · Munich, DE
Stephan Marksteiner · Putzbrunn, DE
Hans-Joerg Timme · Ottobrunn, DE

Key dates

Filing date	Dec 31, 2003
Grant date	Jan 11, 2005
Priority date	—
Expiry date	Dec 31, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/02125
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A resonator apparatus has a piezoelectric resonator as well as an acoustic reflector which has a layer having a high acoustic impedance and a layer having a low acoustic impedance. The thickness of one layer is set different from a quarter of the wavelength in this layer at the operating frequency due to technological limitations in the manufacturing of this layer, and the thickness of the other layer is set dependent from the one layer, such that a predetermined minimum quality of the acoustic reflector is attained.

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