Patent ID: 7609160

Claim:
A system for controlling an interrogation zone of a door-mounted antenna, the system comprising: a door-mounted antenna having a transmitter component and a receiver component; a sensor positioned proximate the door upon which the antenna is mounted, the sensor for determining a distance that the door is moved in relation to a reference plane and transmitting positional signals representative of the distance; and a control unit having: signal receiver circuitry for receiving positional signals from the sensor; a processor for providing interrogation zone modification instructions based upon the received positional signals; and signal transmission circuitry for transmitting signals, the signals including the interrogation zone modification instructions; and wherein the sensor is located proximate the door, the sensor monitoring the movement of the door upon which the antenna is mounted, the sensor determining if the door has moved a threshold distance with respect to the reference plane and if the threshold distance has been attained, altering the interrogation zone.