Use of a subcarrier in an organic semiconductor radio frequency identification system
First Claim
1. A radio frequency identification system comprising:
- a radio frequency identification reader circuit operable to emit a radio frequency carrier signal modulated with a subcarrier having a subcarrier modulation rate; and
a radio frequency identification tag circuit operable to extract the subcarrier from the emitted radio frequency carrier signal, wherein the extracted subcarrier functions as a clock operable to assist in the transfer of a modulated backscattered signal to the radio frequency identification reader circuit and wherein the modulated backscattered signal is decoded by the radio frequency identification reader circuit to obtain data encoded in the radio frequency identification tag circuit.
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Accused Products
Abstract
A radio frequency identification system comprising a radio reader circuit operable to emit a radio frequency carrier signal modulated with a subcarrier, which has a subcarrier modulation rate. The radio frequency identification tag circuit is operable to extract the subcarrier from the emitted radio frequency carrier signal and the extracted subcarrier then functions as a clock, which operates to assist in the transfer of a modulated backscattered signal to the radio frequency identification reader circuit. The radio frequency identification reader circuit decodes the modulated backscattered signal and the data encoded in the radio frequency identification tag circuit is obtained.
9 Citations
24 Claims
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1. A radio frequency identification system comprising:
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a radio frequency identification reader circuit operable to emit a radio frequency carrier signal modulated with a subcarrier having a subcarrier modulation rate; and
a radio frequency identification tag circuit operable to extract the subcarrier from the emitted radio frequency carrier signal, wherein the extracted subcarrier functions as a clock operable to assist in the transfer of a modulated backscattered signal to the radio frequency identification reader circuit and wherein the modulated backscattered signal is decoded by the radio frequency identification reader circuit to obtain data encoded in the radio frequency identification tag circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a radio frequency identification system, comprising:
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emitting from a radio frequency identification reader a radio frequency carrier signal modulated by a subcarrier having a subcarrier modulation rate;
extracting the subcarrier from the emitted radio frequency carrier signal by a first portion of a radio frequency identification tag circuit to obtain a clock signal;
extracting data stored on a second portion of the radio frequency identification tag circuit by synchronizing the clock signal to the stored data; and
transmitting the extracted data to the radio frequency identification reader from the radio frequency identification tag circuit on a modulated backscattered signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A radio frequency identification system, comprising:
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means for emitting a subcarrier modulated radio frequency carrier signal from a radio frequency identification reader circuit;
means for extracting the subcarrier from the emitted radio frequency carrier signal at a radio frequency identification tag circuit to obtain a clock signal;
means for extracting data stored in the radio frequency identification tag circuit; and
means for transmitting the extracted data to the radio frequency identification reader from the radio frequency identification tag circuit.
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18. A radio frequency identification tag, comprising:
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a first circuit operable to receive a subcarrier modulated radio frequency carrier signal, wherein the first circuit is operable to extract a subcarrier signal from the received subcarrier modulated radio frequency carrier signal, and wherein the extracted subcarrier signal is a clock signal; and
a second circuit operable to utilize the clock signal to extract data stored on the radio frequency identification tag by synchronizing the clock signal to the stored data, wherein the first circuit and the second circuit are in electrical communication. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A radio frequency identification tag circuit, comprising:
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means for receiving a subcarrier modulated radio frequency carrier signal;
means for extracting a subcarrier signal from the received subcarrier modulated radio frequency carrier signal to obtain a clock signal;
means for extracting data stored in the radio frequency identification tag circuit; and
means for transmitting the extracted data to the radio frequency identification reader from the radio frequency identification tag circuit.
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Specification