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Title: Inductor Geometries and Inductance Calculations for Power Transfer in Biomedical Implants
Authors: Gupta, Abheek
Advisors: Doug Barlage, Committee Member
Griff Bilbro, Committee Member
Gianluca Lazzi, Committee Chair
Keywords: 3-D on-chip inductors
biomedical implants
power coupling
partial inductance
Issue Date: 26-Mar-2004
Degree: MS
Discipline: Electrical Engineering
Abstract: Biomedical implants used as neural prostheses are often powered by low frequency wireless inductive systems. Such an inductive coil system consists of the primary coil outside the body and the secondary coil implanted on-chip with the prosthesis. This thesis proposes novel designs for the geometry of the on-chip coil and computes the inductive coupling obtained by using the proposed geometries. Traditional inductance calculation methods involve the use of computationally expensive field solvers or complicated analytical methods. A computational method employing the partial inductance concept is used to calculate the self and mutual inductances at low frequencies of certain regular 2-D and 3-D geometries (spirals, rectangular helices, pyramidal inductors etc.). These inductor geometries are fabricated and the measurement results match closely with the values predicted by the simulations. This provides an analytically simple, cost-efficient and computationally fast method of finding the self and mutual inductances of regular 2-D and 3-D geometries which can be used to reliably compute the coupling of the proposed on-chip inductor geometries. The inductor geometry for optimal power transfer can be chosen on the basis of these inductance calculations.
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