The demonstrator shows, through the remote measurement of different substances, that the proposed system can estimate the dielectric permittivity. In this paper a demonstrator of the proposed reader is designed and manufactured. ![]() For that purpose, the proposed design is based on four functional layers: the radiating layer, the RF interface, the IoT mini-computer and the power unit. The IoT functionalities of the reader allows remote sensing from computers and handheld devices. ![]() The reader is used to interrogate the sensors within a short-range wireless link avoiding the direct contact with the substances under test. In this work, a novel low-cost and portable Internet-of-Things (IoT) reader for passive wireless electromagnetic sensors is proposed. This approach highly increases the total cost and complexity of the sensing system. Moreover, the response of these sensors is usually obtained with laboratory equipment. Some of these sensors are used for measuring harmful substances. In the last years, many passive electromagnetic sensors have been reported.
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