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Interrogator/transponder system and mobile transponder device

  • US 5,245,346 A
  • Filed: 08/28/1991
  • Issued: 09/14/1993
  • Est. Priority Date: 12/28/1989
  • Status: Expired due to Fees
First Claim
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1. An interrogator/transponder system comprising:

  • a transmitter stationarily mounted on a fixed side; and

    a receiver mounted on a mobile side;

    said transmitter on the fixed side comprising a transceiver for transmitting a wake-up signal at a low date rate and subsequently a data signal at a high data rate; and

    said receiver on the mobile side comprising wake-up signal receiving means composed of an amplifier having a low frequency band to which a power is constantly supplied and which receives said wake-up signal and actuates a switching means, data signal receiving means composed of an amplifier having a high frequency band to which a power is supplied by the operation of said switching means so as to start the reception of said data signal, signal processing means for outputting data to be transmitted on the basis of said data signal from said data signal receiving means, and transmitting means for transmitting said data to be transmitted.

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