Ultrashort electromagnetic waves IV — Guided propagation

When Doctor S. A. Schelkunoff presented the material contained in this article as a lecture before the basic science group of the New York Section, he remarked that it was “nonmathematical.” Certainly the electrical engineer will welcome any concept which allows an easier approach to the solution of certain problems involved in wave guides than the more complete equivalent field-theory method. In this fourth article in a series of six on ultrashort electromagnetic waves, Doctor Schelkunoff combines transmission-line theory with optical analogy and derives useful relations for both wave guides and cavity resonators. The three preceding articles appeared in the March, April, and May issues of “Electrical Engineering.”