Abstract
The miniaturization of electronics has paved way for implantable devices at the scale of a millimeter or less. Progress in energy storage technologies, however, has been slower and the miniaturization of the power source remains unsolved. Wireless powering provides a potential solution in which electromagnetic energy is transferred from an external source. In this chapter, we analyze powering in the weakly coupled regime and discuss a specific example for a cardiac implant. For a weakly coupled device, we show that optimal powering occurs in the mid-field where power transfer occurs though a combination of inductive and radiative modes in tissue, in contrast to conventional inductive coupling.
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Notes
- 1.
This definition for efficiency is also known as the operating power gain. The reflection at the source is disregarded.
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Ho, J.S., Yeh, A.J., Kim, S., Poon, A.S.Y. (2014). Wireless Powering for Miniature Implantable Systems. In: Yang, Z. (eds) Neural Computation, Neural Devices, and Neural Prosthesis. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8151-5_13
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DOI: https://doi.org/10.1007/978-1-4614-8151-5_13
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