Dispersive antenna for RFID tags
First Claim
Patent Images
1. A transponder, comprising:
- a rectifier;
a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; and
a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier, wherein signal delay through the frequency dispersion element is dependent on frequency.
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Accused Products
Abstract
RFID tag designs and sensors are disclosed that include a dispersive antenna and exhibit greater detection ranges relative to conventional designs. The designs include, for example a transponder having including a rectifier, a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals, and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier. Frequency-dispersive elements (e.g., antennas) and compatible interrogation waveforms can be used so that the rectifying diodes receive high peak voltage levels relative to the average voltage levels.
35 Citations
20 Claims
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1. A transponder, comprising:
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a rectifier; a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier, wherein signal delay through the frequency dispersion element is dependent on frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A transponder, comprising:
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a rectifier; a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; a hysteretic switch coupled between the rectifier and the RFID circuit; and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier, wherein signal delay through the frequency dispersion element is dependent on frequency, said pulse formed from multiple overlapping signals of the multi-phase input signal; wherein the rectifier operates to convert RF energy of the pulse to DC voltage, multiply that DC voltage, and store the resulting voltage. - View Dependent Claims (18)
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19. A transponder, comprising:
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a rectifier; a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; a hysteretic switch coupled between the rectifier and the RFID circuit; and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier, wherein signal delay through the frequency dispersion element is dependent on frequency, said pulse formed from multiple overlapping signals of the multi-phase input signal, and wherein the frequency dispersion element comprises at least one of an antenna, a surface acoustic wave (SAW) correlator, and a dispersive delay line. - View Dependent Claims (20)
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Specification