Extended range RF-ID transponder
First Claim
1. An extended range transponder/interrogator RF-ID arrangement comprising:
- an interrogator for transmitting an interrogation signal;
a transponder located on an object for generating a transponder response signal;
an antenna located along one dimension of said object for receiving said interrogation signal and for transmitting said transponder response signal; and
a coupling coil connected to said antenna for coupling said interrogation signal from said antenna to said transponder and for coupling said transponders response signal from said transponder to said antenna.
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Accused Products
Abstract
An extended range transponder/antenna configuration comprises a standard, state-of-the-art transponder which is coupled to a long and narrow antenna by a loosely coupled coil. The coupling of the coil to the transponder must be loose for a tuned type transponder in order to maintain the high "Q" and to avoid detuning and damping. Both effects of lowering the "Q" and detuning or damping the transponder would have an adverse effect on the receiving function of the transponder and the reading range of the transponder. The RF-ID efficiency of the arrangement is generally optimized for this type of application by the long but narrow antenna solution and by the simple fact that coupling an antenna to a transponder, amplifies the emission of the transponders signal relative to the noise, thus improving the signal-to-noise ratio of the RF-ID system. The fact that the width of the transponder loop antenna can be made very small eliminates, to a high degree, the noise impact on reading range with the result that a large reading range is maintained.
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Citations
29 Claims
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1. An extended range transponder/interrogator RF-ID arrangement comprising:
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an interrogator for transmitting an interrogation signal; a transponder located on an object for generating a transponder response signal; an antenna located along one dimension of said object for receiving said interrogation signal and for transmitting said transponder response signal; and a coupling coil connected to said antenna for coupling said interrogation signal from said antenna to said transponder and for coupling said transponders response signal from said transponder to said antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An extended range transponder/interrogator RF-ID arrangement comprising:
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an interrogator for transmitting an interrogation signal; a transponder located on an object for generating a transponder response signal; an antenna extending away from said object for receiving said interrogation signal and for transmitting said transponder response signal; and a coupling coil connected to said antenna for coupling said interrogation signal from said antenna to said transponder and for coupling said transponders response signal from said transponder to said antenna. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An extended range transponder/interrogator RF-ID arrangement comprising:
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an interrogator for transmitting an interrogation signal, having an interrogation antenna; a transponder located on an object for generating a transponder response signal; an antenna extending away from said interrogation antenna for transmitting said interrogation signal and for receiving and transponder response signal; and a coupling coil for coupling said interrogation signal from said interrogator to said antenna and for coupling said transponders response signal from said antenna to said interrogator. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. An extended range transponder/interrogator RF-ID arrangement comprising:
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an interrogator for transmitting an interrogation signal and receiving an identification code, having an interrogation antenna; a transponder located on an object for generating an identification code in response to having received a predetermined amount of energy from said interrogation signal; an antenna extending away from said interrogation antenna for transmitting said interrogation signal and for receiving said transponder response signal; and a coupling coil for coupling said interrogation signal from said interrogator to said antenna and for coupling said transponders response signal from said antenna to said interrogator.
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Specification