The design of a resonant line impedance measuring device for the frequency range from 100 to 200 mega-cycles.

The problem of measuring impedance is an old one, but its currency is renewed every time there is an advance into the radio-frequency spectrum. The trend in the development of Radio science has been towards higher frequencies, and particularly during the recent war has there been a rapid advance in this direction. The need for, and emphasis on, practical results from wartime development and research has led to the by-passing or at any rate incomplete solution of many problems in the frequency range from 100 to 200 mc. Because of the dearth of information and the lack of practical techniques to deal with measurements at these frequencies, a great part of the practical results were obtained by trial and error, cut and try methods. As a result of some of this work, it is now possible and undoubtedly profitable to review this portion of the spectrum, and to try to evolve, under less urgent conditions, some more practical and efficient methods of measurement. This thesis deals with the problem of developing a device for the measurement of impedance, in the frequency range from 100 to 200 mc. To gain a better understanding of the problem, and to set the stage for what is to come, the first part of the thesis will be devoted to a review of the methods that have been used to measure impedance in the past, and of how these methods have been modified or found unsuitable as the frequency became higher.[...