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I want to experiment with different mechanical designs for some Yagi antennas for 440 MHz through perhaps 2.3 GHz. I am looking for some adhesives and/or potting-like materials that would be relatively RF-inert at those frequencies. Can anyone make a suggestion for a material?

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    $\begingroup$ For what application? A little dab to secure an element in a boom? Or to encapsulate the entire antenna? $\endgroup$ – Phil Frost - W8II Feb 27 '18 at 18:14
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    $\begingroup$ what does "RF-inert" mean to you? Low loss (low $\tan \delta$)? dielectric properties as close as possible to air (low $\epsilon$)? Magnetic properties as close as possible to metal ($\mu_r$)? $\endgroup$ – Marcus Müller Feb 28 '18 at 12:50
  • $\begingroup$ This would be to secure, say, a matching network to a boom. I would like the material of the adhesive to NOT create any significant detuning effects or similar to the original design. $\endgroup$ – mike65535 Mar 5 '18 at 16:45
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Take a look at Epic Resins. They have epoxies and potting compounds that are characterized into the GHz range. Master Bond is another possible source.

Do be aware that when assembling antennas using epoxy, that it can act as a dielectric material. This can affect the primary design parameters of the antenna.

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