Patent ID: 6630905
Filing Date: 2003-10-07
Classification: H01Q

Abstract:
A system for automatically generating a return beam in the direction of a received beam comprising:first means for receiving a first signal having a first frequency and first wavefront from a first direction, wherein said first means is a phased array antenna comprising a plurality of radiating elements; second means for providing a second signal having a second wavefront, said second signal being a phase conjugate of said first signal, said second means including a plurality of phase conjugators each of which are coupled to an associated radiating element to receive an input signal therefrom, each of said phase conjugators including a mixer having said input signal as a first input thereto, said input signal having said first frequency and a first phase; third means for providing a second input to each of said mixers, said second input being derived from said first signal and being a second signal having a frequency equal to twice said first frequency such that the output of said mixer includes a component representative of the negative of said first phase; and fourth means for transmitting said second signal, whereby said second signal is transmitted in a reverse direction relative to the direction of said first signal.