Patent ID: 8350673
Filing Date: 2013-01-08
Classification: G06K,H01Q

Abstract:
1. An RFID device for storing and communicating information to an authorized reader, the RFID device comprising: a cover; a substrate within the cover; an antenna configured to transmit and receive radio frequency signals, wherein the antenna comprises a main portion, a first leg, and a second leg that is electrically decoupled from the first leg when the switching mechanism is in a first position, and wherein the switching mechanism causes the first leg and the second leg to be electrically coupled when the switching mechanism is in a second position; a chip on the substrate coupled with the antenna, the chip including an impedance matching circuit, the chip configured to store information and communicate the information to the authorized reader via the antenna; a switching mechanism configured to tune and detune the antenna relative to the chip to enable and disable, respectively, the chip's ability to communicate the information via the antenna; and an activation mechanism configured to control the switching mechanism, wherein the activation mechanism is user-operable; wherein the impedance matching circuit is configured to ensure that when the switching mechanism is activated, there is a good impedance match between the chip and the antenna, the impedance matching circuit further configured to account for the effects of the substrate and a surface to which the device is attached when the antenna is tuned and detuned via the switching mechanism.