Abstract
Radiation modes of circular dielectric waveguides are discussed. First, a general expression is derived by which the basic formula defining the orthogonality is expresse in terms of only far fields. Next, the orthogonality property of the Dirac's delta type is derived using a general functional form of radiation modes; the idea of distribution function is also used. The conditions that the pairs of mutually orthogonal radiation modes should satisfy are also derived. By using these conditions, several examples of pairs of mutually orthogonal modes are given. One of them is found to coincide with the pair of incident transverse electric (ITE) mode and incident transverse magnetic (ITM) mode named by Snyder
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