Figure 7.

A) Far field wireless power delivery systems use a transmitting antenna to power an implanted antenna using radiating electromagnetic waves. Multiple types of implanted antenna systems have been suggested including B) loop antennas,^{[ 13 ]} C) dipole antennas,^{[ 45 ]} and D) helical antennas.^{[ 46 ]} Adapted with permission.^{[ 13 ]} Copyright 2017, IEEE; Adapted under the terms of the CC BY license.^{[ 45 ]} Copyright 2020, the Authors. Published by Elsevier;^{[ 46 ]} Copyright 2015, Springer Nature.