The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 2003
Filed:
Nov. 15, 2000
Applicant:
Inventors:
Lorenz Gaul, Lenting, DE;
Martin Häring, Germering, DE;
Assignee:
Infineon Technologies AG, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K 1/906 ;
U.S. Cl.
CPC ...
G06K 1/906 ;
Abstract
A device for a contactless transmission of data includes a data transceiver with an antenna. The impedance of the antenna of the data transceiver is purposely mismatched. A reactance is introduced into the antenna in order to tune the antenna to a frequency different from its resonant frequency. In the event that the antenna impedance has to be adapted to the characteristic impedance of a line of unknown length, the loss resistance of the antenna is deliberately increased. The power required to produce a magnetic alternating field with the data transceiver for operating at least one portable data carrier is reduced.