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Article | REF: E3212 V2

Radiofrequency acoustic passive wireless sensors - Interrogations strategies

Authors: Jean-Michel FRIEDT, Sylvain BALLANDRAS

Publication date: July 10, 2020, Review date: January 5, 2021

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4. Signal processing

Measurement of the radio-frequency communication channel, including echoes induced by cooperative targets, provides a sequence of complex values, classically named I and Q for the identity and quadrature quantities. These quantities are classically converted into modulus and phase φ = arctan(Q/I) to extract information about the signal's physical properties. As we shall see in the properties of materials used in piezoelectric substrates (§

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