Patent ID: 8260342

Claim:
A transceiver unit comprising: a transmitter to transmit millimeter wave radio frequency signals to a remote transceiver unit, the remote transceiver unit having a remote transceiver transmitter, a remote transceiver transmitter antenna, a remote transceiver receiver, and a remote transceiver receiver antenna; a transmitter antenna coupled to the transmitter; a receiver to receive millimeter wave radio frequency signals from the remote transceiver unit; a receiver antenna coupled to the receiver to receive millimeter wave radio frequency signals transmitted by the remote transceiver unit, a strength of the power of the signals received by the receiver antenna being inversely related to a distance between the receiver antenna and the remote transceiver transmitter antenna and being dependent on an orientation of the remote transceiver transmitter antenna in relation to an orientation of the receiver antenna; and a control circuit coupled to the transmitter and the receiver to selectively control the transmission of signals by the transmitter and to characterize signals received by the receiver, the control circuit initiating an action when a time-varying signal having a pre-defined waveform is received by the receiver.