Roy Lewallen wrote:
Close. It's Goubau, from "Surface Waves and Their Applications to
Transmission Lines," J. Appl. Phys., vol. 21, 1950. An interesting
variation is described in "Low-Loss RF Transport Over Long Distances",
by M. Friedman and Richard F. Fernsler, IEEE Trans. on Microwave Theory
and Techniques, Vol. 49, No. 2, Feb. 2001, describing a system the
authors describe as "simple, inexpensive, lightweight, and [having] low
attenuation". They used a strip of aluminum foil 6 cm wide and 0.02 mm
thick with periodic punched holes as the line, strung it around a lab
with the strip suspended by threads, and measured low attenuation. How
this could translate to a practical outdoor system for "long distance RF
transportation" as the authors claim is beyond my feeble imagination.

Heh, heh, maybe they modeled it with NEC2. Violating the
height above Mininec ground rule yields a source power of
396 watts and a load power of 340 watts (86% efficiency)
for a 1000 foot line, one foot above ground, on 20m. :-)
(While yielding a Beverage antenna gain of 13 dBi)

How would it work between two ships on a calm ocean?

Can the single-wire transmission line be modeled with EZNEC
if the height is greater than 0.2 wavelength?

Can it be modeled with NEC4? If so, could someone do it
and report the results?
--
73, Cecil http://www.qsl.net/w5dxp


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