Dual track surface acoustic wave RFID/sensor

Details Dual track surface acoustic wave RFID/sensor Dual track surface acoustic wave RFID/sensor

2006-02-28

2006-02-28

Horabik, Michael (Department: 2635)

Communications: electrical

Selective

Interrogation response

C310S31300R, C342S051000

Reexamination Certificate

active

07005964

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.

REFERENCES:
patent: 6127768 (2000-10-01), Stoner et al.
patent: 6570462 (2003-05-01), Edmonson et al.
patent: 6621192 (2003-09-01), Lu et al.
patent: 6708881 (2004-03-01), Hartmann
patent: 6803698 (2004-10-01), Tabota
patent: 6825794 (2004-11-01), Edmonson et al.

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