Phase control method for electronic tags and station and tag implementing said method
First Claim
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1. A method for use by a station in remote polling of electronic tags that may interfere with each other, the method comprising:
- (a) sending at least one polling signal from the station to the electronic tags,(b) receiving reply signals from the electronic tags in response to the polling signal, and(c) bringing the tags into phase alignment before the reply signals are transmitted.
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Accused Products
Abstract
An electronic tag and a method for remote interrogation of electronic tags from a station are provided in which, in reply to polling signals sent from a station, tags send responses which may interfere, the method comprising a step in which the tags are brought into phase before sending their responses.
23 Citations
30 Claims
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1. A method for use by a station in remote polling of electronic tags that may interfere with each other, the method comprising:
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(a) sending at least one polling signal from the station to the electronic tags, (b) receiving reply signals from the electronic tags in response to the polling signal, and (c) bringing the tags into phase alignment before the reply signals are transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A station for remotely polling electronic tags comprising:
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(a) means for sending polling signals to said electronic tags, (b) means for receiving responses from said tags, and (c) control means configured to effect a phasing command for bringing said tags into phase alignment before the responses are transmitted. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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- 20. An electronic tag having means for communicating with a station for receiving polling signals from the station and sending responses to said station comprising means for counting half waves of a phasing command sent by the station, and means for determining a polarity of a determined half wave in said polling signal.
- 23. An electronic tag having means for communicating with a station for receiving polling signals from the station and sending responses to said station comprising means for counting half waves of a phasing command, and wherein said means for communicating with a station send a response having a polarity equal to that of a determined half wave of said phasing command.
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27. A method for remote polling of electronic tags from a station in which, in reply to polling signals sent by said station, the tags send responses which may interfere, and comprising a step in which the tags are brought into phase before sending their responses, wherein the step in which the tags are brought into phase comprises sending of a phasing command by said station, and wherein said step is carried out, at a tag, by counting half waves of a phasing command and determining a polarity of a half wave of a predetermined rank.
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28. A method for remote polling of electronic tags from a station in which, in reply to polling signals sent by said station, the tags send responses which may interfere, and comprising a step in which the tags are brought into phase before sending their responses, wherein the step in which the tags are brought into phase comprises sending of a phasing command by said station, and wherein said step is carried out, at a tag, by counting half waves of a phasing command and sending a response to the station having the polarity of a determined half wave in said phasing command.
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29. A station for remotely polling electronic tags comprising:
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(a) means for sending polling signals to the electronic tags, (b) means for receiving responses from the tags, and (c) control means, in which said polling signals include a command for bringing said tags into phase, (d) wherein the command for bringing said tags into phase comprises a break in sending followed by the sending of an alternating signal, (e) wherein the means for sending polling signals include; (1) means for rapidly bringing an alternating signal to a steady state, (2) a resonant circuit with an inductor and a tuning capacitor, and (3) means for exciting said resonant circuit with an excitation alternating voltage, and (f) wherein the means for rapidly bringing an alternating signal to a steady state comprise; (1) means for blocking said excitation alternating voltage at one half wave, and (2) means for maintaining a permanent current in said inductor. - View Dependent Claims (30)
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Specification