Patent ID: 8902073
Filing Date: 2014-12-02
Classification: G06K

Abstract:
1. A detection and warning device for card protection, comprising: an antenna comprising a tuning circuit responsive to magnetic field emissions in a frequency band associated with contactless smartcard communications; a detector circuit coupled to the antenna and controlled by control logic, the detector circuit configured to attenuate the magnetic field emissions in a vicinity of a contactless smartcard for a predetermined amount of time, wherein the amount of time is determined according to smartcard operating characteristics and is based on an amount of time needed to access data from the contactless smartcard when accessing the data in accordance with a communication protocol, wherein the detector circuit is configured to attenuate the magnetic field emissions by temporarily storing energy associated with the magnetic field emissions, and wherein the control logic is configured to cause the detector circuit to discontinue attenuating the magnetic field emissions upon attenuation of the magnetic field emissions having lasted for the amount of time; and an alerting circuit configured to provide an audible alert powered by the stored energy of the detector circuit.