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Conformable dual‐band wireless energy harvester dedicated to the urban environment
Author(s) -
Berges Romain,
Fadel Ludivine,
Oyhenart Laurent,
Vigneras Valérie,
Taris Thierry
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32461
Subject(s) - rectenna , conformable matrix , electrical engineering , multi band device , radio frequency , wireless , voltage , energy harvesting , engineering , power (physics) , electronic engineering , antenna (radio) , materials science , telecommunications , physics , rectification , quantum mechanics , composite material
This study presents a wireless energy harvester optimized to convert far‐field radio frequency (RF) energy to direct current (DC) voltages at very low received power levels. It is based on a conformable dual‐band rectenna implemented on a polyimide‐based flexible substrate using screen printing technology and commercially off the shelf devices. At 900 MHz, the proposed rectenna provides a rectified voltage of 1 V for a power density of 10.5 mW m −2 and features an RF to DC conversion of 20% for an available input power of −15 dBm reaching 30% at −5 dBm. At 2.4 GHz, the optimal efficiency is only 10%. The harvester has been characterized in laboratory and then tested in a realistic scenario: the remote powering of a clock, consuming 5 μA at 1 V is demonstrated with a smartphone downloading a video at 30 cm.