Doctoral Dissertations

Abstract

"The electromagnetic field equations for microwave propagation through a rectangular waveguide filled with a lossy, isotropic, linear, inhomogeneous material are derived in matrix form and solved numerically by computer. The theoretical effects of photo-induced conductivity and dielectric constant variations on microwave attenuation, phase shift, and voltage standing wave ratio are plotted for typical examples in the X-band frequency range. The theoretical calculations indicate that a two order-of-magnitude change in the conductivity can produce a 25 db change in the attenuation or a 100 degree change in the angle of the reflection coefficient. The theoretical predictions are verified qualitatively by experiments performed on photosensitive cadmium sulfide. An unusually strong, room temperature resonance phenomena was observed experimentally in cadmium sulfide. Electron plasma resonance is the suspected explanation, but no definite conclusions are drawn. Several new microwave applications for photoconductive materials are described. Theoretical calculations coupled with experimental measurements produced accurate conductivity measurement of thin (0.05 mm) silicon wafers at X-band frequencies. This technique could be readily adapted to large-scale automatic conductivity measurements. Microwave measurement of the free electron lifetime in photo-excited cadmium sulfide is also reported"--Abstract, page ii.

Advisor(s)

Skitek, G. G. (Gabriel G.)

Committee Member(s)

Bertnolli, Edward C.
Hord, William E.
Dillman, Norman
Hatfield, Charles, 1920-1993
Rivers, Jack L.

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1969

Pagination

xvii, 177 pages

Note about bibliography

Includes bibliographical references (pages 136-143).

Rights

© 1969 Thomas Paul Van Doren, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Microwaves
Photoconductivity -- Mathematical models
Wave guides -- Materials -- Testing -- Mathematical models

Thesis Number

T 2235

Print OCLC #

6007401

Electronic OCLC #

840830012

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