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Retrodirective antenna systems

  • US 8,284,101 B2
  • Filed: 05/01/2009
  • Issued: 10/09/2012
  • Est. Priority Date: 05/02/2008
  • Status: Expired due to Fees
First Claim
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1. A retrodirective antenna system for receiving an incoming signal from an object and directing an outgoing signal back to the object, comprising:

  • two or more transceiver cells, each of which receives a part of the incoming signal, produces a phase conjugate output signal, which output signals from the cells combine to form an outgoing signal directed back to the object;

    wherein each transceiver cell comprises;

    an antenna component which detects the part of the incoming signal;

    a processor which receives the part of the incoming signal and produces first and second same-side, sideband (SB) signals of the part of the incoming signal;

    a phase shift system comprising a first phase element which receives the first SB signal and outputs a SB signal having a first phase, and a second phase element which receives the second SB signal and outputs a SB signal having a second phase which is in quadrature with the first phase; and

    an IQ modulator comprising an I input port, a Q input port and a phase adjuster, which receives the SB signal having the first phase on the I input port and the SB signal having the second phase on the Q input port, or receives the SB signal having the first phase on the Q input port and the SB signal having the second phase on the I input port, and phase adjusts the SB signals to produce an output signal which is the phase conjugate of the part of the incoming signal.

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