Delayed offset multi-track OFC sensors and tags
First Claim
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1. An orthogonal frequency coded device comprising:
- a substrate;
a transducer fabricated on said substrate; and
plural acoustic tracks each having a bank of orthogonal frequency reflectors, the plural acoustic tracks coupled with the transducer, each acoustic track producing a different orthogonal code sequence with a different delay between a starting chip sequence in each of the different code sequences, the sum of the different code sequences forming an orthogonal coded signal having plural contiguous stepped orthogonal frequencies within a bandwidth for the device, wherein the plural acoustic tracks provide increased coding by including delays in the code sequences.
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Abstract
Apparatus, systems, devices and methods for providing an orthogonal frequency coding technique for surface acoustic wave sensors incorporating the use of multiple parallel acoustic tracks to provide increased coding by phase shifting and delaying a code sequence. The surface acoustic wave sensor includes parallel tracks with multiple reflectors with differing delay offsets to form a complex code sequence. The reflectors may be uniform, but alternatively could include fingers withdrawn, have reflector position modulation, differing frequencies or be spatially weighted.
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Citations
18 Claims
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1. An orthogonal frequency coded device comprising:
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a substrate; a transducer fabricated on said substrate; and plural acoustic tracks each having a bank of orthogonal frequency reflectors, the plural acoustic tracks coupled with the transducer, each acoustic track producing a different orthogonal code sequence with a different delay between a starting chip sequence in each of the different code sequences, the sum of the different code sequences forming an orthogonal coded signal having plural contiguous stepped orthogonal frequencies within a bandwidth for the device, wherein the plural acoustic tracks provide increased coding by including delays in the code sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for producing an orthogonal frequency coded device comprising the steps of:
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providing a substrate; fabricating a transducer on said substrate; fabricating plural parallel acoustic tracks each having a bank of orthogonal frequency reflectors on the substrate, each of the reflectors in the bank of reflectors producing a different orthogonal frequency in a bandwidth; summing the different orthogonal frequencies to form a different orthogonal code sequence having plural contiguous stepped orthogonal frequencies within the bandwidth for the track; coupling each of the plural acoustic tracks with the transducer; delaying the a starting chip sequence in each track; and summing the different orthogonal code sequences from the plural tracks to produce an orthogonal code signal for the device, wherein the plural acoustic tracks provide increased coding by delaying the code sequences. - View Dependent Claims (15, 16, 17, 18)
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Specification