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:
May. 18, 1999
Filed:
Nov. 12, 1996
Herbert Zimmer, Regensburg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A transceiver with an antenna oscillating circuit generates a magnetic field which inductively charges a charge capacitor of a transponder through a transponder oscillating circuit. A frequency-modulated oscillation is thereupon generated in the transponder and that oscillation is transmitted back to the transceiver. In order to ensure that the transceiver will receive the highest possible amplitudes of the frequency-modulated oscillation, the resonant frequency of the antenna oscillating circuit is adapted to the oscillation frequencies of the transponder oscillating circuit. To that end, an impedance is connected, automatically weighted, to the antenna oscillating circuit.