The energy harvesting system was developed for preclinical 4.7 T MRI scanners. The system is composed of a commercial birdcage coil tuned and matched at 200.1 MHz, a harvesting coil and an RF-DC rectifier. The collected energy was used to power a respiratory pressure sensor. The efficiency of the harvesting system was optimized as function of the angular positioning of the harvesting coil in the birdcage. The experiments were carried out with a water phantom and a mouse in vivo. A peak voltage of 1.5V was harvested for 45V input voltage and delivered to a load of 350 Ω.
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