Wireless electromagnetic tracking system using a nonlinear passive transponder
First Claim
1. A transponder in a wireless electromagnetic tracking system, said transponder including:
- a coil for transmitting a signal in a wireless electromagnetic tracking system; and
a rectifying device connected in parallel with said coil.
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Accused Products
Abstract
A wireless electromagnetic tracking system using a nonlinear passive transponder is provided. The transponder employs a coil connected in parallel with a diode. The transponder emits a response signal when an excitation signal is incident upon the coil of the transponder. Inclusion of the diode in the transponder circuit introduces nonlinear characteristics into the waveform of the response signal emitted by the transponder. The nonlinear characteristics can be varied by changing the capacitance level of the transponder circuit. The nonlinear characteristics of the response signal can be used to discern the response signal from the excitation signal when both signals are received at a receiver. The nonlinear characteristics can also be utilized in a system of encoding data that is to be transmitted from a transponder to a receiver.
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Citations
34 Claims
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1. A transponder in a wireless electromagnetic tracking system, said transponder including:
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a coil for transmitting a signal in a wireless electromagnetic tracking system; and
a rectifying device connected in parallel with said coil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for tracking a transponder in a wireless electromagnetic tracking system comprising:
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receiving a first signal at a coil in a transponder in a wireless electromagnetic tracking system; and
rectifying said first signal with a diode connected in parallel with said coil. - View Dependent Claims (9, 10, 11, 12)
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13. A transponder in a wireless electromagnetic tracking system, said transponder consisting of:
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a core for transmitting a signal in a wireless electromagnetic tracking system;
a coil wrapped around said core; and
a diode connected to said coil. - View Dependent Claims (14)
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15. A method for tracking a transponder in a wireless electromagnetic tracking system comprising:
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receiving a first signal at a transponder in a wireless electromagnetic tracking system, wherein said first signal is received at a first frequency;
transmitting a second signal from said transponder, wherein said second signal contains a second frequency. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for transmitting data in a wireless electromagnetic tracking system comprising:
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transmitting a signal from a transponder in a wireless electromagnetic tracking system, wherein said signal contains at least a first frequency and a second frequency, varying at least said second frequency to produce a variation in at least said second frequency; and
encoding data in said signal based upon said variation in at least said second frequency.
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22. A method for tracking a transponder in a wireless electromagnetic tracking system comprising:
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receiving a first signal at a transponder in a wireless electromagnetic tracking system, wherein said first signal is received at a first frequency;
transmitting a second signal from said transponder, wherein said second signal includes said first frequency and a second frequency. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A transponder in a wireless electromagnetic tracking system, said transponder including:
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a coil for transmitting a signal in a wireless electromagnetic tracking system; and
a switching device connected in parallel with said coil. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification