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Old 02-17-2017, 5:35 AM
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Question Painting an antenna

hi

i have build a 4G lte yagi antenna with cooper

and to prevent copper corrosion i will use non conductive spray paint

does spray painting an antenna have any impact on the signal quality ?

thank you
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Old 02-17-2017, 9:20 AM
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I don't believe it does, but I would use a clear coat rather than paint.
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Old 02-17-2017, 9:46 AM
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It can, especially if the paint has conductive ingredients. Minimize the thickness of the paint or clearcoat layer to minimize potential effects on performance.
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Old 02-17-2017, 9:55 AM
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You can test the paint you plan to use. Spray a decent amount on a piece of cardboard. Let it dry completely. Place in microwave and if it does not heat up, your good to go. It has to be dry(cured) before you test it !
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Old 02-17-2017, 10:47 AM
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Thank you very much for the information
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Old 02-17-2017, 12:04 PM
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I've painted probably 100 VHF and UHF antennas and have never seen a problem. I've even tested Ku and Ka band satellite feed radomes with various spray paints and some have very little effect with just one coat. Others attenuate a lot, but painting a plastic radome is a little different than painting a metal antenna.

One thing that does happen is a coating of paint or anything on a metal antenna will cause it to resonate slightly lower in frequency because you are going from a bare metal radiator to one that has a dialectic coating. Its the same effect when going from a bare wire antenna for HF compared to using insulated wire and the effects from that can be several inch differences in wire lengths.

I'm not sure if you will notice on a small Yagi but on long lengths of wire its very noticeable.
prcguy

Last edited by prcguy; 02-17-2017 at 12:08 PM..
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Old 02-17-2017, 11:04 PM
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Use Krylon paint. It doesnt affect RF.
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Old 02-22-2017, 5:32 AM
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ok now my antenna is painted with a thin coat of non-conductive paint (abro white)

and no difference in performance....
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