Radio frequency transponder system
First Claim
Patent Images
1. A radio frequency transponder, comprising:
- a substrate; and
a plurality of planar antennas on the substrate, wherein each antenna has a shape configured to determine a corresponding resonant frequency of the antenna, wherein each of the antennas is configured to determine a phase difference between orthogonal components of a backscattered signal generated in response to excitation of the antenna at the resonant frequency, and wherein the phase difference represents a unique code for the antenna, the unique code being configured to be extracted only from the phase difference between the orthogonal components of the backscattered signal.
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Abstract
Various embodiments relate to a radio frequency transponder. In one embodiment, the transponder includes: a substrate and at least one planar antenna on the substrate, the antenna having a shape determining a corresponding resonant frequency of the antenna, wherein the antenna is configured to cause a phase difference between backscattered signals generated in response to excitation of the antenna by orthogonally polarized interrogation signals at the resonant frequency, and the phase difference represents a code of the antenna.
11 Citations
23 Claims
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1. A radio frequency transponder, comprising:
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a substrate; and a plurality of planar antennas on the substrate, wherein each antenna has a shape configured to determine a corresponding resonant frequency of the antenna, wherein each of the antennas is configured to determine a phase difference between orthogonal components of a backscattered signal generated in response to excitation of the antenna at the resonant frequency, and wherein the phase difference represents a unique code for the antenna, the unique code being configured to be extracted only from the phase difference between the orthogonal components of the backscattered signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio-frequency identification transponder, comprising:
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a dielectric substrate; and a plurality of antennas formed on the substrate and configured to generate backscattered signals each including different polarization components, wherein the antennas comprise a plurality of load elements each of which is configured to determine a phase difference between the different polarization components of the corresponding backscattered signal, and wherein the phase difference represents a unique code for the antenna, the unique code being configured to be extracted only from the phase difference between the different polarization components of the corresponding backscattered signal. - View Dependent Claims (18)
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19. A radio frequency transponder system, comprising:
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a radio-frequency identification transponder, comprising;
i) a dielectric substrate, ii) a plurality of antennas formed on the substrate and configured to generate backscattered signals each including different polarization components and iii) load elements of the antennas each of which is configured to determine a phase difference between the different polarization components of the corresponding backscattered signal, wherein the phase difference represents a unique code for the transponder; anda reader configured to generate the interrogation signals and extract the unique code only from the phase difference between the different polarization components of the corresponding backscattered signal.
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20. A radio frequency reader for interrogating a radio frequency transponder, comprising:
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a frequency interface unit configured to transmit a plurality of polarized interrogation signals and receive a plurality of backscattered signals from the transponder in response, wherein each of the backscattered signals includes different polarization components, wherein the transponder is configured to determine a phase difference between the different polarization components of the corresponding backscattered signal, and wherein the phase difference represents a unique code for the transponder; and a signal processing unit configured to extract the unique code for the transponder only from the phase difference between the different polarization components of the corresponding backscattered signal. - View Dependent Claims (21)
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22. A radio frequency process, comprising:
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transmitting polarized interrogation signals; receiving backscattered signals each including orthogonal components from a transponder in response; determining a phase difference between the orthogonal components of the corresponding backscattered signal, wherein the phase difference represents a unique code for the transponder; and extracting the unique code for the transponder only from the phase difference between the orthogonal components of the corresponding backscattered signal.
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23. A radio frequency transponder, comprising:
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means for transmitting polarized interrogation signals; means for receiving backscattered signals each including orthogonal components from a transponder in response; means for determining a phase difference between the orthogonal components of the corresponding backscattered signal, wherein the phase difference represents a unique code for the transponder; and means for extracting the unique code for the transponder only from the phase difference between the orthogonal components of the corresponding backscattered signal.
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Specification