Patent · US Active

Method for checking an antenna coil

US9316674B2 · kind B2 · utility

3Cited by

3References

14Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Michael Baldischweiler · Munich, DE
Klaus Finkenzeller · Unterföhring, DE
Carsten Bohn · Hersbruck, DE

Key dates

Filing date	Sep 5, 2012
Grant date	Apr 19, 2016
Priority date	—
Expiry date	Sep 5, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH01Q7/00
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A method for contactlessly checking the functionality of an antenna coil for a portable data carrier comprises the steps of exciting the antenna coil, detecting the free, damped oscillation of the antenna coil in response to the excitation, and evaluating the detected free, damped oscillation. The excitation of the antenna coil is effected inductively through a pulsed magnetic field, which may be generated by a single direct-current pulse, such as a Dirac pulse, by means of an exciting coil attached to a pulse generator. The detection of the oscillation of the antenna coil is effected through a measuring antenna, and the evaluation is effected by means of an evaluation device connected to the measuring antenna.

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