SURFACE ACOUSTIC WAVE IDENTIFICATION TAG HAVING AN INTERDIGITAL TRANSDUCER ADAPTED FOR CODE DISCRIMINATION AND METHODS OF OPERATION AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a system and a method, which enables a user to surely discriminate a plurality of responses to an interrogation signal transmitted from a SAW tag in proximity thereto.

SOLUTION: A surface acoustic wave (SAW) identification tag having a coded transducer and methods of operating and manufacturing the tag 100 are presented. In one embodiment, a tag 100 includes: (1) a piezoelectric substrate having a number of reflectors 130 distributed among a group of slots arranged on the substrate 120 by both pulse position and phase position for encoding a number by pulse and phase position; and (2) a SAW transducer 110 located on the substrate for generating a coded interrogation pulse.

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