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Wireless Power Transfer System for Battery-Less Sensor Nodes
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DOI：10.1109/ACCESS.2020.2995783.png)
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For the first time, the design and implementation of a fully-integrated wireless information and power transfer system, operating at 24 GHz and enabling battery-less sensor nodes, is presented in this paper. The system consists of an RF power source, a receiver antenna array, a rectifier, and a battery-less sensor node which communicates via backscatter modulation at 868 MHz. The rectifier circuits use commercially available Schottky diodes to convert the RF power to DC with a measured efficiency of up to 35 & x0025;, an improvement of ten percentage points compared with previously reported results. The rectifiers and the receive antenna arrays were jointly designed and optimised, thereby reducing the overall circuit size. The battery-less sensor transmitted data to a base station realised as a GNU Radio flow running on a bladeRF Software Defined Radio module. The whole system was tested in free-space in laboratory conditions and was capable of providing sufficient energy to the sensor node in order to enable operation and wireless communication at a distance of 0.15 metres.
Keyword:
Schottky diodes
Radio frequency
Rectennas
Wireless power transfer
Robot sensing systems
Resistance
Antenna arrays
Millimeter-wave engineering
rectifiers
wireless power transfer
battery-less
sensors
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3.6
论文数:
9.8W
被引数:
29.4W
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