Dual track surface acoustic wave RFID/sensor
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United States of America Patent
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-
Feb 28, 2006
Grant Date -
Dec 18, 2003
app pub date -
Mar 28, 2003
filing date -
Apr 8, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A SAW RFID tag or sensor has an antenna for receiving and propagating an RF signal, an input/output IDT electrically connected to the antenna, and a dual track reflective IDT having a first track and a second track located adjacent and acoustically coupled to the input/output IDT. An RF signal received from the antenna by the input/output IDT is transformed by the input/output IDT into an acoustic way which is propagated to the dual track IDT. One track of the dual track IDT is in-phase with the phase reference of the input/output IDT and the other track is in quadrature phase with said phase reference. The input/output IDT receives two orthogonal complex modulated acoustic waves reflected from the first and second tracks and transforms them to a modulated orthogonal complex RF signal which is propagated from the antenna.
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