1. A method of locating one or more radio frequency identification (RFID) tags comprising: illuminating at least one RFID tag by an exciter; receiving information signals from the illuminated at least one RFID tag by a plurality of receive antennas; determining a phase derivate for the received information signals from the at least one illuminated RFID tag received by each of the plurality of receive antennas; and identifying a location of the at least one RFID tag based on the determined phase derivates of the received information signals.