Zero-Power Harmonic Tag Sensors Based on Orthogonally Polarized Waves
Valentina Palazzi
Giulia Orecchini
Giacomo Schiavolini
Giordano Cicioni
Raffaele Salvati
Guendalina Simoncini (Università degli Studi di Perugia)
Paolo Mezzanotte
Luca Roselli
Federico Alimenti
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Abstract
This paper investigates, for the first time, the feasibility of harmonic tag sensors based on orthogonally polarized waves. The main tag building blocks (circular and dual polarization antennas, Schottky diode frequency doubler and phase shifter) are designed, implemented with standard PCBs technology and materials, and experimentally characterized. Finally a proof-of-concept of the whole system operating at 1.04/2.08 GHz is proposed and validated in laboratory. The system can recover the encoded phase regardless the interrogation distance.