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Title page for ETD etd-12192003-031027

Type of Document Master's Thesis
Author Gupta, Abheek ,
URN etd-12192003-031027
Title Inductor Geometries and Inductance Calculations for Power Transfer in Biomedical Implants
Degree Master of Science
Graduate Program Electrical Engineering
Advisory Committee
Advisor Name Title
Gianluca Lazzi Committee Chair
Doug Barlage Committee Member
Griff Bilbro Committee Member
Keywords
  • 3-D on-chip inductors
  • biomedical implants
  • power coupling
  • partial inductance
Date of Defense 2003-12-18
Availability unrestricted
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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