🚀 go-pugleaf

In article <6790@tekig7.PEN.TEK.COM> thomasn@tekig5.pen.tek.com (Thomas M Nathe) writes:
>From: thomasn@tekig5.pen.tek.com (Thomas M Nathe)
>Subject: Re: coating materials for antennas
>Keywords: antennas materials
>Date: 30 Aug 92 06:22:06 GMT
>I've used hot dip anodizing and zinc oxide paint for aluminum with moderate
>success with the zinc oxide.  The hot dip works well for salt spray and other
>hostile enviroments, don't know the cost though. The zinc oxide paint was used
>as a primer on the helocopters I worked on while doing time in the army.

If for some reason painting is needed for antenna, you should use paint with 
high dielectric constant. The amount of loss based on this process, if you 
drive the boudray condition, is the ratio of both dielectric constants of 
two different mediums. If you have metal with free radical in it as 
sugessted, the field decays (skin depth), and since you can not paint less 
than that thickness, you will lose most of the signal. Most polymers have 
dielectric constant of 2.2 (e.r= Epsilon sub r), remember e.o is 5.8 e-12 F/
m, and e=e.o x e.r.Aluminum oxide has dielectric constant of about 8.0. Use 
ACRYLIC ENAMEL, I believe it has no free radical in it.


Peace and Prosperity!
  ---==< 110 >==---