Wireless Power Transfer to Miniature Implants: Transmitter Optimization

This paper examines transmitter optimization for wirelessly powering a small implant embedded in tissue. The wireless link between the transmitter and receiver is first modeled as a two-port network and an expression for the power transfer efficiency derived. For a given small receiver in a multilay...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2012-10, Vol.60 (10), p.4838-4845
Main Authors: Sanghoek Kim, Ho, J. S., Poon, A. S. Y.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Atmospheric modeling
Couplings
Current density
Current distribution
Efficiency
Exact sciences and technology
Focusing
Implants
Layered media
Magnetic multilayers
near-field antenna
Optimization
Power transfer
power transfer efficiency
Protective coatings
Radiocommunications
Receivers
SAR
Spray painting
Telecommunications
Telecommunications and information theory
Transmitters
Transmitters. Receivers
wireless implant
wireless power transfer
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Summary:This paper examines transmitter optimization for wirelessly powering a small implant embedded in tissue. The wireless link between the transmitter and receiver is first modeled as a two-port network and an expression for the power transfer efficiency derived. For a given small receiver in a multilayer tissue model, the transmitter is abstracted as a sheet of magnetic current density for which the optimal distribution is analytically found. The optimal transmitter is compared to the point and uniform source across a range of frequencies. At higher frequencies, the optimal current distribution is shown to induce fields that exhibit focusing. The effects of constructive and destructive interference substantially improves the power transfer efficiency and reinforces operation in the low GHz-range. The optimal transmitter establishes an upper bound on the power transfer efficiency for a given implant and provides insight on the design of the optimal transmit antenna.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2012.2207341