Patent ID: 8319612
Filing Date: 2012-11-27
Classification: G06K,H04B,H04W,Y02D

Abstract:
1. A transponder detector comprising: an antenna assembly; a first circuit coupled to said antenna assembly, said first circuit configured to generate and transmit one or more detection signals via said antenna assembly, wherein the first circuit comprises an inverter which shapes the one or more detection signals to a selected width and amplitude; a second circuit coupled to said antenna assembly, said second circuit configured to receive one or more response signals from said antenna assembly resulting from transmission of said one or more detection signals, wherein said one or more response signals have a transponder parameter; and a controller configured to detect the presence of a transponder having a transponder frequency in a proximal space of said transponder detector based on said transponder parameter of one or more said response signals, wherein the inverter connects a series resistance to a parallel capacitance, the series resistance including a switched resistor controlled by a resistance switch, and the parallel capacitance including a switch capacitor controlled by a capacitor switch, and wherein said controller is further configured to evaluate a power value of each of said one or more response signals based on said transponder parameter and compare each of said power values of each of said one or more response signals against a safety threshold value.