https://devzone.nordicsemi.com/f/nordic-q-a/11324/ground-plane-under-antenna-matching-componentsWe&#39;re designing a new revision of our open source sensor beacon platform: http://ruuvi.com Just want to make sure I got this right. nRF51/2 Reference PCB Guidelines states: A PCB with a minimum of two layers, including a ground plane, is recommendeden-USTelligent Community 13Thu, 14 Jan 2016 17:14:28 GMThttps://devzone.nordicsemi.com/thread/42593?ContentTypeID=1Thu, 14 Jan 2016 17:14:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f29e64ff-cf99-4dea-be56-430cd98e54d7Lauri J&#228;ms&#228;<p>Great, thanks for this info.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/42592?ContentTypeID=1Thu, 14 Jan 2016 17:00:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:14b93924-4442-4f4a-9dea-369fcb9e11a7bjorn-spockeli<ol> <li> <p>Yes, the bottom ground layer is needed in order to shield the matching network. Keep-out areas apply to signals, ground and power planes in the inner layers . A general rule of thumb is to use the layer furthest away from the matching network as ground.</p> </li> <li> <p>Yes, the bottom ground layer is needed in order to shield the matching network.</p> </li> </ol> <p>I will look into the recommended PCB thickness and update my answer.</p> <p><strong>Update:</strong> Nordic layouts are recommended for <strong>1.6mm</strong> to <strong>0.8mm</strong> PCB thickness. Anything thinner requires tuning of the matching network and possible degradation of performance.</p> <p>Best regards,</p> <p>Bjørn</p><div style="clear:both;"></div>