Surface acoustic wave transponder configuration
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Aug 18, 1997
filing date -
Aug 18, 1997
priority date (Note) -
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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 at least two reflective elements disposed in the acoustic path of the acoustic wave such that an acoustic path length of the acoustic wave on the substrate is longer than twice a largest linear dimension of the substrate. The device preferably includes an angled elongated conductor formed on said substrate, having angle magnitudes whose sum exceeds .pi. radians, said angled elongated conductor defining at least a portion of the acoustic path.
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