Frequency hopping method for RFID tag
First Claim
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1. A method, comprising:
- sending power to at least one radio frequency (RF) identification (RFID) transponder (tag) by;
a) sending power Pj for a first time tj to the tag at a first frequency ƒ
j chosen from a list of N frequencies ƒ
1 . . . ƒ
j, ƒ
j+1 . . . ƒ
N; and
then b) sending power Pj+1 for a time tj+1 to the tag at a second frequency ƒ
j+1 chosen from the list of N frequencies, wherein tj and tj+1 are substantially different times, and wherein the time between sending power Pj and Pj+1 is less than a time t0 in which the tag loses a particular tag function if no power is sent to the tag.
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Abstract
Radio frequency (RF) power is sent out by a base station to radio frequency identification transponders (RFID tags) for a first time at a first frequency. The frequency is changed to a second frequency, and the RF power sent out for a second time substantially different from the first time.
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Citations
11 Claims
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1. A method, comprising:
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sending power to at least one radio frequency (RF) identification (RFID) transponder (tag) by;
a) sending power Pj for a first time tj to the tag at a first frequency ƒ
j chosen from a list of N frequencies ƒ
1 . . . ƒ
j, ƒ
j+1 . . . ƒ
N; and
thenb) sending power Pj+1 for a time tj+1 to the tag at a second frequency ƒ
j+1 chosen from the list of N frequencies, wherein tj and tj+1 are substantially different times, and wherein the time between sending power Pj and Pj+1 is less than a time t0 in which the tag loses a particular tag function if no power is sent to the tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification