초록 ▼

An electronic identification and recognition system which has a battery powered identifier. The reader section radiates stimulus to the identifier section. A battery is switched on and power a clock and memory which in turn vary the reactance of the identifier antenna circuit. The change in reactanc

An electronic identification and recognition system which has a battery powered identifier. The reader section radiates stimulus to the identifier section. A battery is switched on and power a clock and memory which in turn vary the reactance of the identifier antenna circuit. The change in reactance affects the phase angle of the voltage within the reader antenna. The phase angle changes are detected and recorded by the reader section such that the internal code of the identifier section is determined.

대표청구항 ▼

An electronic recognition and identification system comprising: a reader section including an oscillator, a reader antenna connected to said oscillator for radiating electromagnetic power responsive to said oscillator, and a detection means connected to said reader antenna and to said oscillator for

An electronic recognition and identification system comprising: a reader section including an oscillator, a reader antenna connected to said oscillator for radiating electromagnetic power responsive to said oscillator, and a detection means connected to said reader antenna and to said oscillator for detecting changes in a vector phase angle of a voltage across said reader antenna relative to the oscillator signal and for delivering output signals responsive to said changes in vector phase angle; and an identifier section having an identifier antenna for receiving power from said reader antenna by mutual coupling, a reactance modulation circuit connected to said identifier antenna, a data register means for providing an advance and sequence of data joined to said reactance modulation circuit, such that a vector phase angle of a current of said modulation circuit varies responsive to said sequence of data, a battery for powering said data register means, a diode connected intermediate said identifier antenna and said battery such that the battery is recharged when the identifier section is in close proximity to the reader section, and means for switching on power from said battery when the identifier section is in close proximity to the reader section and for switching off power from said battery when the identifier section is distant from the reader section.