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

摘要

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