Date of Award

Summer 1983

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Electrical Engineering and Computer Science

First Advisor

Ishii, T. K.

Second Advisor

Josse, Fabien

Third Advisor

Schneider, Susan C.

Abstract

In the last few years, microwaves have become well known for their use in communication. Until twenty years ago, the principal use of microwaves was in radars, both military and civil. But now because of the large Increase In the transmission of information and the resulting need to use higher frequency ranges, microwaves are being used for telephone links for long distance calls, as well as satellite communication between continents. Also, microwaves are used for radio astronomy, navigation, and the study of the physical and chemical properties of matter. Microwave systems are like other communication systems; each needs a transmitter and a receiver. The crystal detector associated with most microwave receivers may be injured or destroyed by exposure to excessive voltages. Up to now, protection has been provided by using non-linear switching devices, which rely on gas ionization, non-linear effect of ferrites, or non-linear characteristics of semiconductor materials. All of these devices are expensive for companies or consumers to use. As a result, the main objective of this research is to study inexpensive simple linear devices that can do the same protection but affordably and efficiently. Most of these devices use automatically control led mismatching for protection purposes. In order to characterize the protection capability of these simple linear devices, some research needed to be conducted to develop new expressions to predict the behavior of such devices as protective elements, and then to experimentally test them. The results of this research are presented in this thesis .

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