Patent · US Expired

Data carrier having a communication resonant circuit and having means for changing the resonant frequency of this resonant circuit in either sense

US6708891B2 · kind B2 · utility

2Cited by

4References

5Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Franz Amtmann · Graz, AT
Thomas Burger · Graz, AT

Key dates

Filing date	May 2, 2001
Grant date	Mar 23, 2004
Priority date	—
Expiry date	Apr 5, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG06K19/0723
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A data carrier (1) for contactless communication with a communication station has a substrate (2) and a communication resonant circuit (3) connected to the substrate (2) and consisting of a communication coil (4) and of a capacitor configuration (6) and having a resonant frequency (fR) which should have a nominal value, changing unit (9) for changing the resonant frequency (fR) being provided, which changing unit enable the resonant frequency (fR) to be changed from an initial value both to higher frequency values and to lower frequency values.

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