Wireless power transfer system to capsule endoscope at sub-gigahertz (GHz) frequency is presented. Compact self-resonant antennas are designed to realize the transcutaneous power transfer. Experiment shows that at a distance of 5 cm, the designed system operating at 433.9 MHz can realize 1.21% power transfer efficiency (PTE) through duck intestine and porcine multilayered tissues, that is, 47.55 mW power delivered to load (PDL) at the specific absorption rate (SAR) occupational exposure limitation.
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