Patent ID: 9418261
Filing Date: 2016-08-16
CPC Classification: G06K

Claim Text:
1. An apparatus (A) for contactless identification of a tag unit (GX) having circuitry configured to modify an alternating electromagnetic field (EM TX ) within which the tag unit (GX) is located, the apparatus (A) comprising: a transmitter circuit (TX) that generates an electric source signal (Ss); a transmitter antenna (TA), connected to the transmitter circuit (TX), that receives the electric source signal (Ss) and, based on the source signal (Ss), emits an alternating electromagnetic field (EM a receiver circuit (RX), connected to the receiver antenna (RA), that produces an electric detection signal (Sd) in response to the received first and second portions of the alternating electromagnetic field (EMTX, EMGX) registered by the receiver antenna (RA), wherein the receiver antenna (RA) is arranged relative to the transmitter antenna (TA) and the tag unit (GX) such that the first portion of the emitted alternating electromagnetic field (EMTX) reaches the receiver antenna (RA), in an unmodified form, including when the tag unit (GX) is outside of the range of operation from the antenna (TA), and the receiver circuit (RX) further produces the aiding signal component (Sa) originating from the unmodified first portion of the alternating electromagnetic field (EMTX) received in the unmodified form; and a processing unit (PU) that receives the electric detection signal (Sd) and the produced aiding signal component (Sa) from the receiver circuit (RX), and based on the received electric detection signal (Sd) and the received aiding signal component (Sa), discriminates identification data (GXid) of the tag unit (GX) having caused the modification of the alternating electromagnetic field (EMGX) as emitted from the transmitter antenna (TA) to thereby identify the tag unit (GX).