RFID TRANSPONDER WITH HIGH DOWNLINK DATA RATE
First Claim
Patent Images
1. A RFID transponder comprising:
- a high quality factor antenna (LR);
a resonance capacitor (CR) coupled to the high quality factor antenna (LR) for providing a resonant circuit (LR, CR), wherein the RFID transponder has a symmetrical RF input stage and is adapted to vary the quality factor of the resonant circuit (LR, CR) such that the quality factor is low during downlink data transmission when the RFID transponder receives data through the antenna (LR), and the quality factor is high during uplink data transmission, when the RFID transponder transmits data.
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Abstract
A RFID transponder includes a high quality factor antenna, and a resonance capacitor coupled to the high quality factor antenna for providing a resonant circuit. The RFID transponder has a symmetrical RF input stage and is adapted to vary the quality factor of the resonant circuit such that the quality factor is low during downlink data transmission when the RFID transponder receives data through the antenna, and the quality factor is high during uplink data transmission, when the RFID transponder transmits data.
32 Citations
20 Claims
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1. A RFID transponder comprising:
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a high quality factor antenna (LR); a resonance capacitor (CR) coupled to the high quality factor antenna (LR) for providing a resonant circuit (LR, CR), wherein the RFID transponder has a symmetrical RF input stage and is adapted to vary the quality factor of the resonant circuit (LR, CR) such that the quality factor is low during downlink data transmission when the RFID transponder receives data through the antenna (LR), and the quality factor is high during uplink data transmission, when the RFID transponder transmits data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13, 14, 15, 16, 17, 18, 19, 20)
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9. A RFID system having a reader-unit and a RFID transponder, the RFID transponder comprising:
- a high quality factor antenna (LR), and a resonance capacitor (CR) coupled to the high quality factor antenna (LR) for providing a resonant circuit (LR, CR), wherein the RFID transponder has a symmetrical RF input stage and is adapted to vary the quality factor of the resonant circuit (LR, CR) such that the quality factor is low during downlink data transmission when the RFID transponder receives data through the antenna (LR), and the quality factor is high during uplink data transmission, when the RFID transponder transmits data.
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10. A method of operating a RFID transponder, the method comprising:
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switching a resonant circuit of the RFID transponder for receiving and transmitting a RF signal to a low quality factor during downlink data transmission; and switching to a high quality factor during uplink data transmission by use of symmetrical damping means. - View Dependent Claims (11, 12)
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Specification