https://devzone.nordicsemi.com/f/nordic-q-a/9605/tx-power-level-vs-antenna-performanceHi, At present time I perform many tests with power level and link stability. And noticed that if cover nRF base device with hand or put into pocket the disconnection with reconnection occure. The rssi level seem to be stable (about -65dbm) at exacten-USTelligent Community 13Mon, 12 Oct 2015 07:48:09 GMThttps://devzone.nordicsemi.com/thread/35497?ContentTypeID=1Mon, 12 Oct 2015 07:48:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03a3c376-080b-4aa8-9081-0f3bf0985a16MartinBL<p>Hi. We have some reference layouts <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51.v1.0.0/pdflinks/ref_layout.html?cp=2_6">here</a> showing how we recommend to do the antenna layout. We also have a couple of antenna related white papers <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.whitepapers.v1.0.0/white_papers.html?cp=11">here</a>. You can also create a <a href="https://www.nordicsemi.com/eng/nordic/mypage">MyPage</a> account and submit a support ticket and ask for a confidential review of your design.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/35496?ContentTypeID=1Mon, 12 Oct 2015 07:41:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17e7eaea-3705-4913-a253-c757f299c52fValer_I<p>Are the any antenna designs shared by Nordic? Or any recomendation documents?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/35495?ContentTypeID=1Wed, 07 Oct 2015 18:23:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c566875c-4803-4b31-8780-25ae1a2cc2deDave_couling<p>You need to tune your antenna to its average environment. This means tuning it when in close proximity to the human body. Human Body will likely downtune your center frequency and decrease your bandwidth. Therefore you must offset this, by up-tuning. Your best bet is to use a VNA to tune, and place the product on a human body while tuning.</p> <p>-DC</p><div style="clear:both;"></div>