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Please use this identifier to cite or link to this item: http://www.lib.ncsu.edu/resolver/1840.16/2709

Title: A Comparison of Two and Three Dimensional Wire Antennas for Biomedical Applications
Authors: Soora, Shruthi
Advisors: Kevin Gard, Committee Member
Gianluca Lazzi, Committee Chair
Douglas Barlage, Committee Member
Keywords: miniature antenna
retinal prosthesis
three dimensional antenna
compact antenna
implantable antenna
Issue Date: 27-Feb-2006
Degree: MS
Discipline: Electrical Engineering
Abstract: Miniature antennas are necessary to reduce the size of communications and biomedical devices, specifcally for a retinal prosthesis. A comparison of two dimensional and three dimensional antennas are presented as an attempt to miniaturize and reduce the antenna footprint size while enhancing antenna characteristics such as bandwidth, maximum gain and the radiation pattern. This work explores various two dimensional antennas and converts them into three dimensional implementations by folding and rotating the dipole arms. This changes the current vector alignment which can enhance the antenna characteristics. Further comparison between the 2D and 3D antennas are investigated in a transmitter/reciever system. The 2D and 3D antennas are tested and compared in air and inside eye phantoms to replicate the communications link of a retinal prosthesis system. To accurately model the vitreous humor of the eye, methods to mimic the electrical properties of a biological medium are also investigated. This work demonstrates the feasibility of three dimensional wire antennas for the application of a retinal prosthesis. Three dimensional wire antennas are ideal due to their smaller planar size, wider bandwidth and coupling characteristics in comparison to the two dimensional implementation.
URI: http://www.lib.ncsu.edu/resolver/1840.16/2709
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