Electronic identification and recognition system with code changeable reactance
First Claim
1. An electronic recognition-identification system comprising:
- a recognition network with a sweep oscillator for generating signals of various frequencies, a first antenna means for radiating signals responsive to the oscillator frequencies and for radiating to another antenna means, means connected to said first antenna means for detecting perturbations in the signals across said first antenna means and for delivering information signals responsive to said perturbations; and
an identification network including a second antenna means for radiating to said first antenna means, a data register means to advance and provide a sequence of data, a reactance modulation circuit connected to the second antenna means and to said data register means such that the frequency of said modulation circuit varies responsive to said sequence of data.
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Abstract
An electronic identification and recognition system in which the recognition portion includes a voltage controlled oscillator which sweeps over a range of frequencies. The identification portion resonates at certain frequencies determined by a variable reactance in the resonant circuit in the identifier which is responsive to bits from a sequential data register. The bits result in the on-and-off switching of the variable reactance which modifies the resonant frequency in the identification portion or modifies the frequency of an oscillator in the identification portion. The changes and sequence of changes in the resonant frequency are detected and recorded by the recognition portion such that the internal code of the identifier is determined.
146 Citations
15 Claims
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1. An electronic recognition-identification system comprising:
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a recognition network with a sweep oscillator for generating signals of various frequencies, a first antenna means for radiating signals responsive to the oscillator frequencies and for radiating to another antenna means, means connected to said first antenna means for detecting perturbations in the signals across said first antenna means and for delivering information signals responsive to said perturbations; and an identification network including a second antenna means for radiating to said first antenna means, a data register means to advance and provide a sequence of data, a reactance modulation circuit connected to the second antenna means and to said data register means such that the frequency of said modulation circuit varies responsive to said sequence of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification