Phase acquisition techniques for RFID multistatic setups

Abstract The aim of this paper is to present two different schemes to retrieve the phase of the field scattered by a UHF RFID tag without requiring a physical connection between the transmitter and the receiver systems. Thus, the phase angle can be comfortably measured in a multistatic, easy to deploy RFID sensor network for different purposes such as location and imaging. The accuracy of both schemes is validated against the one achieved by resorting to a physical connection between the transmitter and the receiver, demonstrating an excellent accuracy. Finally, a localization scheme based on this acquired information is presented to illustrate the use of the proposed phase retrieval approaches.