Radiation Patterns of an RF Energy Harvesting Necklace on Human Body Phantom
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The far-field electromagnetic radiation patterns of different dipole antennas used for an RF energy harvesting necklace for smart jewelry are studied. Rigid Vee, U-shaped copper and flexible silver-ink dipoles are explored with and without a human body phantom. Measurements demonstrate the advantages of Vee or U-shaped dipoles for harvesting more RF energy at the sides of the human body compared to a straight dipole. The flexible RF energy harvesting necklace can produce 72.2 μW at 5.3 m from a 3 W EIRP 915 MHz RF transmitter when worn by a person.