Inexpensive modulated backscatter reflector
First Claim
Patent Images
1. A Tag for an RFID communication system using MBS comprising:
- a data storage device containing information;
a modulator consisting of one CMOS semiconductor gate electrically connected directly at a first end of the semiconductor gate to the data storage device allowing the semiconductor gate to receive the information; and
an antenna having a certain reflectivity and electrically connected directly to a second end of the semiconductor gate such that the CMOS semiconductor gate modulates the reflectivity of the antenna in accordance with the received information.
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Abstract
The present invention provides for an inexpensive RFID Tag design which uses an inexpensive Backscatter Modulator. The modulator is simply a CMOS gate driven by a shift register containing a modulating signal. The CMOS gate is connected to the antenna such that it modulates the reflectivity of the antenna in accordance with the modulating signal. In a second embodiment, the Tag is incorporated into a single CMOS integrated circuit which comprises all of the components, except for the antenna, necessary to implement an inexpensive read-only RFID Tag.
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Citations
13 Claims
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1. A Tag for an RFID communication system using MBS comprising:
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a data storage device containing information;
a modulator consisting of one CMOS semiconductor gate electrically connected directly at a first end of the semiconductor gate to the data storage device allowing the semiconductor gate to receive the information; and
an antenna having a certain reflectivity and electrically connected directly to a second end of the semiconductor gate such that the CMOS semiconductor gate modulates the reflectivity of the antenna in accordance with the received information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A Tag for an RFID communication system using MBS comprising:
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an antenna having a certain reflectivity; and
an integrated circuit electrically connected to the antenna for modulating the reflectivity of the antenna in accordance with information stored in the integrated circuit, wherein the integrated circuit comprises a data storage device for storing the information and a modulator consisting of one CMOS semiconductor gate connected directly at a first end of the semiconductor gate to the antenna and directly at a second end of the semiconductor gate to the data storage device for modulating the reflectivity of the antenna in accordance with the stored information. - View Dependent Claims (11, 12)
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13. A Tag for an RFID communication system using MBS comprising:
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a data storage device containing information;
a modulator consisting of one CMOS semiconductor gate electrically connected to the data storage device allowing the semiconductor gate to receive the information; and
an antenna having a certain reflectivity and electrically connected to the semiconductor gate such that the CMOS semiconductor gate modulates the reflectivity of the antenna in accordance with the received information, wherein the CMOS semiconductor gate is electrically connected directly to a feed point of the antenna.
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Specification