RESISTIVE AND CAPACITIVE MODULATION IN AN ELECTROMAGNETIC TRANSPONDER

• US 20110063087A1
• Filed: 11/03/2010
• Published: 03/17/2011
• Est. Priority Date: 12/05/2003
• Status: Active Grant

• Current Assignee: Stmicroelectronics France (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SA (STMicroelectronics NV)
• Inventors: Enguent, Jean-Pierre
• Granted Patent: US 8,754,753 B2
• Time in Patent Office: Days
• US Class Current: 340/10.3
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Abstract

The selection of at least one back-modulation element of an electromagnetic transponder from among a plurality of resistive and/or capacitive modulation elements of the load of an oscillating circuit of the transponder, including selecting the modulation element(s) according to a binary message received from a read/write terminal.

Claims

1-8. -8. (canceled)

9. A method of communicating with a transponder proximate to a terminal, the method comprising:

A) determining a communication configuration for the terminal, the communication configuration comprising a tuning of oscillating circuits of the terminal;

B) determining an indicator for the communication configuration; and

C) transmitting to the transponder the indicator for the communication configuration.

10. The method of claim 9, wherein the indicator is a portion of a frame transmitted by the terminal to the transponder.

11. The method of claim 10, wherein the frame is a frame according to ISO standard 14443.

12. The method of claim 11, wherein the frame is a REQB frame.

13. The method of claim 9, further comprising an act of repeating the acts of determining a communication configuration, determining an indicator, and transmitting over a plurality of iterations to determine an optimal communication configuration.