Variable frequency tag
AssigneeMineral Lassen LLC
InventorIan James Forster
Life of this patent
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Abstract
An antenna assembly is operative for receiving interrogating radiation at a variable frequency tag and generating a corresponding received signal, and for receiving a signature signal and radiating corresponding response radiation. A logic unit is operative for receiving the received signal and outputting the signature signal in response, the signature signal including a signature code for use in identifying the tag. A voltage controlled oscillator is operative for controlling a rate at which the signature code is output; and a power supply is operative for providing an electrical potential difference for energizing the tag. The voltage controlled oscillator is operable to output the signature code at a rate which is governed by the magnitude of the received signal.
Claims38
A variable frequency tag, comprising:
- interfacing circuitry configured to:
- receive interrogating radiation at the tag and generate a corresponding received signal having a magnitude;
- and
- receive a signature signal and radiate corresponding response radiation;
- processing circuitry configured to receive the received signal and output the signature signal in response, wherein the signature signal includes a signature code that identifies the tag;
- clocking circuitry configured to control a rate at which the signature code is output;
- and
- power supplying circuitry configured to provide an electrical potential difference for energizing the tag;
- wherein the clocking circuitry is further configured to change a rate at which the signature code is output based on the magnitude of the received signal.
Dependencies are inferred from the claim text.