Autonomous Sensor Node Powered over WiFi: A Use Case Study

Florian Grante, Ghalid Abib, Muriel Muller, Nel Samama

Abstract

This paper presents a new approach to the sizing of a radio frequency energy harvesting system. Starting from a sensor node to define our system constraints such as its energy requirement or its supply voltage, an energy budget analysis protocol is developed to validate whether it is possible to power such a system with a Radio Frequency to Direct Current (RF/DC) converter. We study a converter capable of harvesting RF signals in the Industrial, Scientific and Medical (ISM) band at 2.45 GHz whose ambient power has been previously characterized. Finally, the duty cycle is determined, i.e., how long would it take the converter to recover the required energy in order to power the sensor node.

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