Tuneable wireless tags using spatially inhomogeneous structures
First Claim
1. A device responsive to a wireless electromagnetic interrogation signal and having a plurality of non-equivalent interacting current pathways representing multi-bit information, each of the pathways responding differently to the interrogation signal and the responses contributing to the provision of the multi-bit information, wherein at least one of the pathways is altered to encode the represented multi-bit information.
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Accused Products
Abstract
Wireless tags with a plurality of non-equivalent current pathways altered to collectively represent encoded information, each of which responds differently to an interrogation signal. The element is subjected to a signal stimulating the current pathways, each of which contributes to an overall element response. The information may be recovered from the salient features of this overall response. These salient features include resonant frequency, amplitude, relative peak position, relative peak amplitude, damping, and Q factor.
53 Citations
36 Claims
- 1. A device responsive to a wireless electromagnetic interrogation signal and having a plurality of non-equivalent interacting current pathways representing multi-bit information, each of the pathways responding differently to the interrogation signal and the responses contributing to the provision of the multi-bit information, wherein at least one of the pathways is altered to encode the represented multi-bit information.
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11. An electromagnetically-responsive structure for encoding multi-bit information, the encoded information being wirelessly readable in a frequency domain, the structure comprising:
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a first current pathway having a first electromagnetic response; and
a second current pathway having a second electromagnetic response and being electromagnetically coupled to the first current pathway, wherein the electromagnetic coupling results in at least one attribute of the first and second electromagnetic responses approximating a norm, wherein at least one of the pathways is altered to encode the represented multi-bit information. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for encoding multi-bit information on a wireless tag, the encoded information being wirelessly readable in a frequency domain, the method comprising:
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(a) providing a first current pathway having a first electromagnetic response;
(b) providing a second current pathway having a second electromagnetic response, and being electromagnetically coupled to the first current pathway, wherein the electromagnetic coupling results in at least one attribute of the first and second electromagnetic responses approximating a norm; and
(c) altering at least one of the current pathways to encode the represented multi-bit information. - View Dependent Claims (19, 20, 21, 22)
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23. A method of wirelessly sensing multi-bit information comprising the steps of:
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(a) providing a device responsive to a wireless electromagnetic excitation signal and having a plurality of non-equivalent current pathways, wherein at least some of the plurality of pathways have been altered to encode the multi-bit information, each of the pathways responding differently to the excitation signal and;
(b) subjecting the device to the wireless electromagnetic excitation signal;
(c) extracting salient features of the electromagnetic response of the device; and
(d) recovering the multi-bit information based on the values of the salient features in the electromagnetic response. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An electromagnetically-responsive structure for encoding multi-bit information, the encoded information being wirelessly readable in a frequency domain, the structure comprising:
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a first pathway characterized by having a first electromagnetic response and having a pair of opposing, electrically-conductive traces electrically connected through at least one point; and
a second electrically-conductive pathway electromagnetically coupled to the first trace, the second pathway having a pair of opposing, electrically-conductive traces electrically connected through at least one point, wherein the electromagnetic coupling results in at least one attribute of the first electromagnetic response approximating a norm.
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Specification