Authors:
Florian Grante
;
Ghalid Abib
;
Muriel Muller
and
Nel Samama
Affiliation:
Laboratoire Samovar, Institut Polytechnique de Paris, Télécom SudParis, Département Electronique et Physique (EPh), 19, rue Marguerite Perey, 91120, Palaiseau, France
Keyword(s):
RF Electromagnetic Energy Harvesting, WiFi, Autonomous Sensor, Schottky Diode, RF/DC Rectifier, Boost, Energy Budget Analysis, Green IoT, DC/DC Boost, Super Capacitor.
Abstract:
In this paper, we propose a 2.45 GHz RF energy harvesting system to power a battery free Internet of Things
(IoT) sensor node. The system operates from an RF signal with a power as low as -20 dBm and includes an
RF to DC converter, a storage super capacitor and a voltage DC/DC up-conversion. The system components
are sized to provide the required electric energy to operate the connected object. The tested connected object
includes an ARM microcontroller, an ultra low-power sensor (temperature, pressure and humidity) and a
Bluetooth Low Energy interface for a wireless transmission toward a terminal such as a smartphone or tablet.
It requires 200 μJ per transmission cycle, which must be provided by the proposed harvesting system. This
system is tested in an anechoic chamber and using a constant power RF signal to characterize the energy
recovery time needed for measuring and transmitting the sensor data. Promising results show that the system
is capable of sending data after 5
hours of RF energy harvesting from a source distant with one meter.
(More)