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This paper describe a passive, chip-less millimeter wave Radio Frequency IDentification (RFID) technology that uses an array of microscopic resonant elements implanted into the paper, cardboard, and plastic substrates typically used for an optical label, such as a barcode. When illuminated with RF energy, the resonant array provides a "RF Fingerprint" based on parameters including density, thickness, and orientation of the embedded resonant elements. When the reflected RF energy is received by a tag reader placed at a distance, signal processing algorithms that detect and identify these "RF Fingerprints" enable asset enrollment, identification and tracking.
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