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Rectenna

  • US 9,837,857 B2
  • Filed: 06/25/2013
  • Issued: 12/05/2017
  • Est. Priority Date: 06/29/2012
  • Status: Expired due to Fees
First Claim
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1. A rectenna comprising:

  • an antenna configured to receive a radio wave;

    a rectifier circuit configured to rectify the radio wave received by the antenna, the rectifier circuit including a diode that is coupled to a filter, the filter being coupled to a DC output;

    a transmission line connected to the antenna and the rectifier circuit; and

    having a length equal to ¼

    of a wavelength of a fundamental of the radio wave received by the antenna;

    a modulation input circuit including a variable capacitance diode, the variable capacitance diode being connected at one end to a portion of the transmission line between an antenna connecting portion at which the antenna is connected to the transmission line and a rectifier circuit connecting portion at which the rectifier circuit is connected to the transmission line, and configured such that capacitance thereof varies in accordance with a voltage of a modulated signal wave input to the other end of the variable capacitance diode; and

    a capacitor connected to the modulation input circuit between the variable capacitance diode and a resistor, the resistor being connected to the modulation input circuit,wherein the variable capacitance diode has an anode directly connected to the transmission line thereby hindering a carrier wave on the transmission line from entering the modulation input circuit, which reduces loss of the carrier wave.

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