New experiments on the behaviour of the hybrid TEM-dual surface wave in a coaxial cable

Screened and unscreened axially-cylindrical surface-waves

“…Since a thin dielectric coating over a metal surface appears to be the most satisfactory way of accentuating its inductive reactance without, at the same time, adding much to its resistance (Barlow and Mira Sen 1968), attention will be focused here on that arrangement. In particular, loading of this kind will be applied to the inner supporting surface, using a low-loss dielectric whose permittivity is 2-5 timest that of the surrounding medium in which the power is transmitted.…”

“…The particular case of r2 =25 x 10-3 m is then examined in more detail, because here some experimental information was available (Barlow and Mira Sen 1967), and the effect of progressively increasing the loading on the inner surface is traced (see figure 3).…”