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Time variant antenna for transmitting wideband signals

  • US 10,135,650 B2
  • Filed: 11/20/2014
  • Issued: 11/20/2018
  • Est. Priority Date: 11/20/2013
  • Status: Active Grant
First Claim
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1. A circuit for tuning a resonance frequency of an electrically small antenna, the circuit comprising:

  • a first source configured for providing a modulation signal;

    a second source configured for providing a periodic electrical signal;

    an antenna; and

    a tuning circuit comprising;

    a first capacitive device;

    a second capacitive device; and

    a switch configured for alternately coupling the first capacitive device and the second capacitive device to the antenna for modulating a resonance frequency of the antenna between a first resonant frequency and a second resonant frequency and only between the first resonant frequency and the second resonant frequency in response to the modulation signal,wherein the first source is configured for providing the modulation signal to the tuning circuit so that the switch alternately couples one of the first capacitive device and the second capacitive device to the antenna while decoupling the other one of the first capacitive device and the second capacitive device from the antenna when a voltage across the other one of the first capacitive device and the second capacitive device is zero.

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