Insulated Antennas

Attention is invited to the short discussion in Reference Data for Radio
Engineers, fifth edition, page 22-30. This relates to G-Line, a related
problem. For brown polyethylene, Fig 37 gives a phase velocity reduction
of 4.2 percent for a wire of 1/100 wavelength diameter, with coated
diameter to uncoated diameter ratio equal to 2.0. For a diameter of
1/1000 wavelength, the reduction is 2.8 percent.

I do not have the reference, Electronics, April 1954, V27 pp 180-184
(while Electronics was still a technical magazine, pre M-H). However, at
first thought, it seems that this phase velocity is closely related to th
shortening of insulated (dilectric coated) antennas.
W4MB
Received on Fri Feb 16 1996 - 22:03:00 EST