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Focal waveform of a prolate-spheroidal impulse radiating antenna (IRA)


Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/3609

Focal waveform of a prolate-spheroidal impulse radiating antenna (IRA)

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Title: Focal waveform of a prolate-spheroidal impulse radiating antenna (IRA)
Author: Altunc, Serhat
Advisor(s): Schamiloglu, Edl
Committee Member(s): Christodoulou, Chrostos G.
Baum, Carl E.
Stone, Alex
Department: University of New Mexico. Dept. of Electrical and Computer Engineering
Subject: impulse radiating antenna
focal waveform
LC Subject(s): Transmitting antennas
Antennas, Reflector
Pulse generators
Degree Level: Doctoral
Abstract: Impulse Radiating Antennas (IRAs) are designed to radiate very fast pulses in a narrow beam with low dispersion and high field amplitude. For this reason they have been used in a variety of applications. IRAs have been developed for the transient far-field region using paraboloidal reflectors. However, in this dissertation we focus on the near field region and develop the field waveform at the second focus of a prolate-spheroidal IRA. Recent research has shown that it is possible to kill certain skin cancers by the application of fast, high-amplitude electric-field pulses. This has been accomplished by the insertion of electrodes near the tumor, with direct contact from a high-voltage pulse generator. It has been suggested that it would be desirable to be able to apply fast, high-electric-field pulses without direct contact for this biological application, i.e., to irradiate them using an antenna from a distance. Analytical, numerical and experimental behaviors for the focal waveforms of two and four-feed arm prolate-spheroidal IRAs are explored. With appropriate choice of the driving waveform we maximize the impulse field at the second focus. The focal waveform of a prolate-spheroidal IRA has been explained theoretically, verified experimentally and simulated using the CST-MWS (Microwave Studio) software. Finally, different lens design procedures are discussed for a prolate-spheroidal IRA for better concentrating the energy from an impulse.
Graduation Date: December 2007
URI: http://hdl.handle.net/1928/3609

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