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Passive wireless connection

  • US 9,124,358 B2
  • Filed: 11/29/2011
  • Issued: 09/01/2015
  • Est. Priority Date: 11/29/2010
  • Status: Active Grant
First Claim
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1. A wireless switch system comprising:

  • an exciter powered by an alternating current (AC) mains and transmitting an always available, unmodulated, continuous wave (CW) narrowband RF excitation signal;

    a radio frequency (RF) transponder including a narrowband receiver operative to develop a generated power from the narrowband RF excitation signal and an ultra wideband (UWB) transmitter powered by the always available generated power of the narrowband receiver, the UWB transmitter having a bandwidth of at least 500 MHz and being operative to transmit RF UWB pulses;

    a switch, wherein the RF transponder is coupled to the switch to sense an on-or-off sensed switch state, and wherein the UWB transmitter modulates the transmitted UWB pulses to comprise a Time Doman Carrierless Impulse Radio (TDCIR) signal with a fractional bandwidth of greater than or equal to 10% to transmit the sensed switch state, whereby the transmitted UBW pulses are not a continuous wave signal; and

    an actuator including a UWB receiver adapted to receive the transmitted UBW pulses.

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