Electronic identification system with power input-output interlock and increased capabilities
First Claim
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1. An electronic identification system, comprising, in combination:
- a reading station including means to radiate a power pulse, anda portable identifier comprising;
an identifier antenna for receiving said power pulse from said reading station, and for transmitting a coded radio frequency signal from said identifier to said reading station;
a power store within said portable identifier;
a power gate circuit switchable for conducting or preventing conduction of said power pulse to said power store from said identifier antenna;
an encoder circuit energizable for generating said coded radio frequency signal;
an output gate circuit switchable for transmitting said coded radio frequency signal to said identifier antenna; and
a control circuit energizable by said power store for controlling said circuits and for energizing said encoder circuit.
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Abstract
A portable electronic identification system comprised of an identifier preferably of credit card size, and a fixed position reader which couples to it over short distances by space transmitted signals. The identifier card is energized from and the resulting signals are synchronized and detected by the reader. The identifier uses one loop antenna to both receive and send all signals, and provisions are made to prevent interference of these functions. The use of multiple radio frequencies greatly increases the data rate. Data that is unique to the authorized bearer is recorded in the identifier to minimize the likelihood of fraudulent use.
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Citations
12 Claims
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1. An electronic identification system, comprising, in combination:
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a reading station including means to radiate a power pulse, and a portable identifier comprising; an identifier antenna for receiving said power pulse from said reading station, and for transmitting a coded radio frequency signal from said identifier to said reading station; a power store within said portable identifier; a power gate circuit switchable for conducting or preventing conduction of said power pulse to said power store from said identifier antenna; an encoder circuit energizable for generating said coded radio frequency signal; an output gate circuit switchable for transmitting said coded radio frequency signal to said identifier antenna; and a control circuit energizable by said power store for controlling said circuits and for energizing said encoder circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification