Patent ID: 8710960
Filing Date: 2014-04-29
Classification: G06K,H01Q

Abstract:
1. A method for protecting the privacy of information stored on an RFID tag comprising an antenna, a switching mechanism, and a chip, the chip including an impedance matching circuit, the method comprising: activating the switching mechanism to electrically couple a first leg of the antenna to a second leg of the antenna; in response to activating the switching mechanism, matching the impedance between the chip and antenna so as to tune the antenna relative to the chip via the impedance matching circuit, wherein said impedance matching circuit is configured to account for the effects of a substrate to which the RFID tag is attached; communicating the information to a reader when the antenna is tuned; deactivating the switching mechanism to electrically decoupled the first leg of the antenna from the second leg of the antenna; and in response to deactivating the switching mechanism, mismatching the impedance between the chip and antenna so as to detune the antenna relative to chip after the information is communicated to the reader.