"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.
Skitek, G. G. (Gabriel G.)
Bertnolli, Edward C.
Hord, William E.
Hatfield, Charles, 1920-1993
Rivers, Jack L.
Electrical and Computer Engineering
Ph. D. in Electrical Engineering
University of Missouri--Rolla
xvii, 177 pages
© 1969 Thomas Paul Van Doren, All rights reserved.
Dissertation - Open Access
Photoconductivity -- Mathematical models
Wave guides -- Materials -- Testing -- Mathematical models
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Van Doren, Thomas, "Microwave propagation through isotropic inhomogeneous photoconductive media" (1969). Doctoral Dissertations. 2211.