Passive sensing and encoding transponder
First Claim
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1. A passive transponder comprising:
- antenna means for receiving and transmitting signals;
oscillating means for generating a signal of a first frequency in response to signal received by the antenna means;
counting means connected to receive the signal from the oscillating means and to provide output signals at selected frequencies integrally divisible into the first frequency;
at least one multiplexing sequencing means having a series of input terminals, selected ones of which are altered to provide an identification code, the at least one multiplexing sequencing means being connected to receive signals from the counting means and the oscillating means;
encoding mens connected to the oscillating means, the counting means, the at least one multiplexing sequencing means, and the antenna for selecting which of the signals from the oscillating means, the counting means, and the at least one multiplexing means shall be supplied to the antenna; and
reset means coupled to the counting means for sensing the signals received by the antenna means and inhibiting the operation of the passive transponder until the signals being received by the antenna means possess sufficent energy to operate the passive transponder.
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Abstract
A passive transponder for identifying objects remote to an interrogator includes an oscillator which generates a first frequency signal, a counter which divides the first frequency into a series of lower frequency signals, at least one multiplexer having a series of input terminals selected ones of which may be grounded to provide an identification code, and an encoder connected to the oscillator, the counter, the at least multiplexer, and an antenna for selecting which of the signals from the oscillator, counter, and at least one multiplexer shall be supplied to the antenna.
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Citations
15 Claims
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1. A passive transponder comprising:
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antenna means for receiving and transmitting signals; oscillating means for generating a signal of a first frequency in response to signal received by the antenna means; counting means connected to receive the signal from the oscillating means and to provide output signals at selected frequencies integrally divisible into the first frequency; at least one multiplexing sequencing means having a series of input terminals, selected ones of which are altered to provide an identification code, the at least one multiplexing sequencing means being connected to receive signals from the counting means and the oscillating means; encoding mens connected to the oscillating means, the counting means, the at least one multiplexing sequencing means, and the antenna for selecting which of the signals from the oscillating means, the counting means, and the at least one multiplexing means shall be supplied to the antenna; and reset means coupled to the counting means for sensing the signals received by the antenna means and inhibiting the operation of the passive transponder until the signals being received by the antenna means possess sufficent energy to operate the passive transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A passive transponder comprising:
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antenna means for receiving and transmitting signals; impedance matching means for matching the impedance of the antenna means with that of an oscillating means, the oscillating means for generating a signal of a first frequency in response to signal received by the antenna means; counting means connected to receive the signal from the oscillating means and to provide output signals at selected frequencies integrally divisible into the first frequency; at least one multiplexing sequencing means having a series of input terminals, selected ones of which are altered to provide an identification code, the at least one multiplexing sequencing means being connected to receive signals from the counting means and the oscillating means; encoding means connected to the oscillating means, the counting means, the at least one multiplexing sequencing means, and the antenna for selecting which of the signals from the oscillting means, the counting means, and the at least one multiplexing means shall be supplied to the antenna; and reset means coupled to the counting means for sensing the signals received by the antenna means and inhibiting the operation of the passive transponder until the signals being received by the antenna means posses sufficient energy to operate the transponder, the reset means including; additional counting means connected to the counting means and to receive the signal from the oscillating means and to provide an output signal at a frequency integrally divisible into the first frequency; and comparison means for comparing the output signal from the additional counting means with at least one of the output signals from the counting means to thereby determine when the counting means is functioning correctly and to reset the counting means if it is not functioning correctly.
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Specification