nRF52810 antenna signal fading with epoxy or resin coated

[huho]

Hi，

     So I was using nRF52810 with epoxy or resin coated，but actually the signal quality did not match my needs, the signal faded about 20dB compared to the device which not coated.

     In order to provide a proper match, the antenna manufacturers designed several antennas to match the device which are coated.But the signal is not getting better.

     And also we try to adjust PI network to match which are coated, the network analyzer shows that the frequency point falls at 2.4GHz. But actually the signal is not getting better. When we adjust PI network, L1 and C3 are still soldered.Can they be replaced？

      Is that possible the  examples of epoxy or resin are not  appropriated？Can you perhaps suggest a few suitable examples of an epoxy or resin to coat the CEAA package with?

     

[Marjeris Romero]

Hi,

I am sorry for the late reply.

Is that possible the  examples of epoxy or resin are not  appropriated？

Yes, it's possible that the resin type is not the appropiated. To test this you can place a sample of the settled resin in a microwave for a couple of seconds. If the sample gets hot it is absorbing RF waves and can't be used.

Black epoxy uses often carbon which will have more impact in this matter than clear epoxy, so we have seen some problems when black epoxy is used in the past.

When we adjust PI network, L1 and C3 are still soldered.Can they be replaced？

 Have you done conducted measurements for the output power after L1? L1 and C3 can also be tuned in order to adjust the output power of the radio and the harmonics but I recommend you to do the measurements before to see if they need adjustment.

Best regards,

Marjeris