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Sensors 2017, 17(10), 2268; doi:10.3390/s17102268

Passive Sensors for Long Duration Internet of Things Networks

Instituto de Telecomunicações, Departamento de Electrónica Telecomunicações e Informática, Universidade de Aveiro, Aveiro 3810-193, Portugal
Author to whom correspondence should be addressed.
Received: 21 August 2017 / Revised: 27 September 2017 / Accepted: 30 September 2017 / Published: 3 October 2017
(This article belongs to the Special Issue New Generation Sensors Enabling and Fostering IoT)
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In this work, three different concepts are used to develop a fully passive sensor that is capable of measuring different types of data. The sensor was supplied by Wireless Power Transmission (WPT). Communication between the sensor and reader is established by a backscatter, and to ensure minimum energy consumption, low power techniques are used. In a simplistic way, the process starts by the transmission of two different waves by the reader to the sensor, one of which is used in power transmission and the other of which is used to communicate. Once the sensor is powered, the monitoring process starts. From the monitoring state, results from after processing are used to modulate the incoming wave, which is the information that is sent back from the reader to the tag. This new combination of technologies enables the possibility of using sensors without any cables or batteries to operate 340 cm from the reader. The developed prototype measures acceleration and temperature. However, it is scalable. This system enables a new generation of passive Internet of Things (IoT) devices. View Full-Text
Keywords: Wireless Sensor Networks; Radio Frequency Identification; passive sensor; low power sensor; backscatter communication; Wireless Power Transmission Wireless Sensor Networks; Radio Frequency Identification; passive sensor; low power sensor; backscatter communication; Wireless Power Transmission

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pereira, F.; Correia, R.; Carvalho, N.B. Passive Sensors for Long Duration Internet of Things Networks. Sensors 2017, 17, 2268.

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