Surface acoustic wave transponder configuration
First Claim
1. A method of modulating an acoustic beam having a beamwidth, comprising the steps of selectively providing, along a path of the acoustic beam, one or more non-transducing elements which impose a phase delay on the acoustic wave, wherein at least a portion of elements are disposed over only a portion of the beamwidth, resulting in phase interference modulation of the acoustic beam.
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Accused Products
Abstract
An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having elements which reflect portions of the acoustic wave having a component orthogonal to the incident wave. The reflectors may be, for example, trackchangers or reflective arrays compressors (RAC). The wave may be phase-amplitude modulated for increased efficiency expressed in bits per tap. Such phase amplitude modulation is preferably imposed by partial beam width phase delay elements disposed within an acoustic beam path.
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Citations
24 Claims
- 1. A method of modulating an acoustic beam having a beamwidth, comprising the steps of selectively providing, along a path of the acoustic beam, one or more non-transducing elements which impose a phase delay on the acoustic wave, wherein at least a portion of elements are disposed over only a portion of the beamwidth, resulting in phase interference modulation of the acoustic beam.
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7. A method of modulating an acoustic wave, comprising generating an acoustic wave on a substrate, said acoustic wave propagating along a propagation axis and having a beam width along an axis perpendicular to the propagation axis, providing a phase delay pad disposed along the propagation axis within the beam width, occupying less than the entire beam width;
- summing the acoustic power of the acoustic beam after interaction with the phase delay pad; and
outputting the summed acoustic power. - View Dependent Claims (8)
- summing the acoustic power of the acoustic beam after interaction with the phase delay pad; and
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9. A device for modulating an acoustic beam having a beamwidth, comprising:
- one or more non-transducing elements disposed along a predetermined path of an acoustic beam on a substrate, said elements being adapted for imposing a phase delay on the acoustic wave, wherein at least a portion of said elements are disposed over only a portion of the beamwidth, resulting in phase interference modulation of the acoustic beam.
- View Dependent Claims (10, 11, 12, 13, 14, 17)
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15. A device for modulating an acoustic wave, comprising an electroacoustic transducer for generating an acoustic wave on a substrate, said acoustic wave propagating along a propagation axis and having a beam width along an axis perpendicular to the propagation axis, a phase delay pad disposed along the propagation axis within the beam width, occupying less than the entire beam width;
- and a summer for summing the acoustic power of the acoustic beam after interaction with the phase delay pad.
- View Dependent Claims (16)
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18. A method of modulating an acoustic beam having a beamwidth, comprising the steps of selectively providing, along a path of the acoustic beam, one or more elements which impose a phase delay on the acoustic wave, wherein at least a portion of elements are disposed over only a portion of the beamwidth, wherein at least a subset of said elements modulate the acoustic beam in a QAM constellation pattern, wherein said QAM constellation pattern has about 2n states, and wherein n is an integer greater than or equal to 2.
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19. A method of modulating an acoustic beam having a beamwidth, comprising the steps of selectively providing, along a path of the acoustic beam, one or more elements which impose a phase delay on the acoustic wave, wherein at least a portion of elements are disposed over only a portion of the beamwidth, and equalizing a phase delay of portions of said acoustic beam across the width of the acoustic beam after passing said elements and prior to any transducing of the entire acoustic wave into an electrical signal.
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20. A method of modulating an acoustic beam having a beamwidth, comprising the steps of selectively providing, along a path of the acoustic beam, one or more elements which impose a phase delay on the acoustic wave, wherein at least a portion of elements are disposed over only a portion of the beamwidth, and splitting the acoustic beam after passing said elements and subjecting a portion of said split beam to a further set of elements for modulating said acoustic beam.
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21. A device for modulating an acoustic beam having a beamwidth, comprising:
- one or more elements disposed along a predetermined path of an acoustic beam on a substrate, said elements being adapted for imposing a phase delay on the acoustic wave, wherein at least a portion of said elements are disposed over only a portion of the beamwidth, wherein at least a subset of said elements are adapted to modulate the acoustic beam in a QAM constellation pattern having about 2n evenly spaced signal states in said QAM constellation, wherein n is an integer greater than 1.
- View Dependent Claims (22)
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23. A device for modulating an acoustic beam having a beamwidth, comprising:
- one or more elements disposed along a predetermined path of an acoustic beam on a substrate, said elements being adapted for imposing a phase delay on the acoustic wave, wherein at least a portion of said elements are disposed over only a portion of the beamwidth, and a structure for equalizing a phase delay of portions of said acoustic beam across the width of the acoustic beam after passing said elements and prior to interacting with a full beam width acousto-electric transducer.
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24. A device for modulating an acoustic beam having a beamwidth, comprising:
- one or more elements disposed along a predetermined path of an acoustic beam on a substrate, said elements being adapted for imposing a phase delay on the acoustic wave, wherein at least a portion of said elements are disposed over only a portion of the beamwidth, and a splitter for splitting the acoustic beam, disposed past said elements along an acoustic beam propagation path, and a further set of elements for modulating said acoustic beam disposed to interact with a split portion of the acoustic beam.
Specification