My device is a Bluetooth beacon. It will work placed on a metallic part. What epoxy can I use that prevents the metal underneath the antenna from affecting the RF?

how can prevent the ground plane to shift the frequency? enter image description here

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    \$\begingroup\$ I doubt epoxy has any effect on it. If the metal part is affecting the signal, no epoxy will fix it. \$\endgroup\$
    – Eugene Sh.
    Jun 28, 2021 at 16:32
  • \$\begingroup\$ yeah I know the metal underneath is impacting in RF performance but I need something that can prevent the metal affect the RF \$\endgroup\$
    – Sussy
    Jun 28, 2021 at 16:39
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    \$\begingroup\$ @Sussy - Hi, Please stop using the text box at the bottom of the page for adding new information. It is labeled "Your Answer" and would be used by other people to answer your question. You should add new info / diagrams etc. by making an Edit to the question (I did that for you). You can reply to someone's comment (which doesn't add new information requiring an edit) by writing a comment yourself (not an answer). This difference between answers & comments is one of the ways that Stack Exchange differs from typical internet forums. Please read the tour and help center to see more site rules. \$\endgroup\$
    – SamGibson
    Jun 28, 2021 at 17:19
  • \$\begingroup\$ What you need is distance between them. \$\endgroup\$
    – user16324
    Jun 28, 2021 at 17:52
  • \$\begingroup\$ the PCB has like 1 cm between PCB and metal. \$\endgroup\$
    – Sussy
    Jun 28, 2021 at 17:57

1 Answer 1


what Epoxy can I use that helps the Rf don't get affected by the metal underneath the antenna?

What you want is impossible – you can't "hide" the metal plane with a coating.

  • \$\begingroup\$ While I don't think it's a matter of selecting an "Epoxy", there are microwave absorbent materials, that if placed between the antenna and the metal plate, might reduce the detuning of the antenna (and I think that is OP's question, though not expressed as such). But I agree, he's barking up the wrong tree and should get help to redesign or retune the antenna to work in the environment required. \$\endgroup\$ Jun 28, 2021 at 19:42

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