APPARATUS AND METHOD FOR COMMUNICATING WITH AN RFID TRANSPONDER
First Claim
1. A method of communicating with a transponder on a carrier substrate in a printer, comprising:
- energizing a transceiver to a first power level and writing first data to the transponder while the transceiver is energized at the first power level, wherein the first power level is independent of a frequency of a wireless signal used to write the first data; and
energizing the transceiver to a second power level that is independent of the frequency of the wireless signal and reading second data from the transponder while the transceiver is energized at the second power level, the second power level is different from the first power level.
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Accused Products
Abstract
A system having a UHF RFID transceiver is adapted to communicate exclusively with a single electro-magnetically coupled transponder located in a predetermined confined transponder operating region. The system includes a near field coupling device comprising a plurality of lines connected in parallel with an unmatched load. The near field coupling device may be formed, for example on a printed circuit board with a plurality of electrically interconnected traces and a ground plane. The system establishes, at predetermined transceiver power levels, a mutual electro-magnetic coupling which is selective exclusively for a single transponder located in a defined transponder operating region. Also included are methods for selective communication with the transponder in an apparatus such as a printer-encoder.
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Citations
18 Claims
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1. A method of communicating with a transponder on a carrier substrate in a printer, comprising:
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energizing a transceiver to a first power level and writing first data to the transponder while the transceiver is energized at the first power level, wherein the first power level is independent of a frequency of a wireless signal used to write the first data; and energizing the transceiver to a second power level that is independent of the frequency of the wireless signal and reading second data from the transponder while the transceiver is energized at the second power level, the second power level is different from the first power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of communicating with a transponder on a carrier substrate in a printer, comprising:
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energizing a transceiver to a plurality of power levels with the transceiver disposed at a plurality of distances from at least one transponder to thereby communicate with the transponder; determining rates of successful communication between the transceiver and the transponder for the plurality of power levels and for the plurality of distances between the transceiver and the transponder; and selecting a first power level associated with a relatively high rate of successful communication between the transceiver and the transponder for a limited range of distances between the transceiver and the transponder. - View Dependent Claims (17)
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18-25. -25. (canceled)
Specification