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Same-aperture any-frequency simultaneous transmit and receive communication system

  • US 10,651,886 B2
  • Filed: 08/14/2019
  • Issued: 05/12/2020
  • Est. Priority Date: 07/30/2012
  • Status: Active Grant
First Claim
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1. An any-frequency simultaneous transmit and receive (STAR) system, the system comprising:

  • a) a first antenna element that transmits a first RE transmit signal and that receives an RF receive signal;

    b) a second antenna element that transmits a second RF transmit signal, wherein the first and second RF transmit signals and the RF receive signal occupy any RF frequency;

    c) a signal connector configured to connect a path to and from the first antenna element, a path from an output of a transmit path and an input of a receive path;

    d) a first transmit signal adjuster comprising an input connected to the transmit path;

    e) a second transmit signal adjuster, wherein an output of the first transmit signal adjuster and an output of the second transmit signal adjuster are combined at an output of a combiner;

    f) a signal differencing device comprising a first input connected to the receive path and a second input connected to the output of the combiner, the signal differencing device being configured to receive combined copies of the first and second RF transmit signals and to subtract them from the RE receive signal, thereby mitigating an effect of both the first and the second RF transmit signals on the RF receive signal; and

    g) a signal processor comprising an input connected to an output of the signal differencing device, an output connected to an input of the first transmit signal adjuster and connected to an input of the second transmit signal adjuster and connected to a receive output, the signal processor being configured to receive attenuated combined copies of the first and second RF transmit signals and to determine a complex value of at least one of the first and second RF transmit signals so as to minimize at least one of residual first and second RF transmit signals in the RF receive signal at the receive output.

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