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Proximity sensing using EHF signals

  • US 9,444,523 B2
  • Filed: 10/13/2015
  • Issued: 09/13/2016
  • Est. Priority Date: 06/15/2011
  • Status: Active Grant
First Claim
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1. A communication system comprising:

  • a first amplifier configured to receive a radio frequency input signal and generate an amplified output signal having an extremely high frequency (EHF) component;

    a transducer operatively coupled to receive the amplified output signal from the first amplifier, the transducer configured to transform the amplified output signal to an electromagnetic signal operating in the EHF band of the electromagnetic frequency spectrum; and

    a proximity-sensing circuit, including a frequency detection circuit, operatively coupled to the transducer via a plurality of signal conductors and configured to;

    compare a frequency of a composite signal to a frequency of a reference signal, the composite signal received from the plurality of signal conductors, the reference signal received from a reference conductor operatively coupled to the proximity-sensing circuit, wherein the reference signal is a clock signal representative of the frequency of the amplified output signal when the transducer field-modifying device is in a reference position, andgenerate an indication of proximity of the communication system to the transducer field-modifying device when the frequency of the composite signal is different than the frequency of the reference signal.

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