NCSU Libraries
Search the Collection|Browse Subjects|Services|Library Information|Community |News & Events

Title page for ETD etd-11292005-125256

Type of Document Master's Thesis
Author Soora, Shruthi ,
Author's Email Address ssoora@gmail.com
URN etd-11292005-125256
Title A Comparison of Two and Three Dimensional Wire Antennas for Biomedical Applications
Degree Master of Science
Graduate Program Electrical Engineering
Advisory Committee
Advisor Name Title
Gianluca Lazzi Committee Chair
Douglas Barlage Committee Member
Kevin Gard Committee Member
Keywords
  • miniature antenna
  • retinal prosthesis
  • three dimensional antenna
  • compact antenna
  • implantable antenna
Date of Defense 2005-10-27
Availability unrestricted
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.
Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  etd.pdf 7.17 Mb 00:33:11 00:17:04 00:14:56 00:07:28 00:00:38