https://devzone.nordicsemi.com/f/nordic-q-a/7499/a-way-to-optimize-signal-strengthhi, i&#39;m trying to develop a wearable health device. actually, the device is a little unusual because it is attached to the Armpit or sole of the foot or inside knee .. the problem is signal strength is very weak after attached. ( -85dbm under ) en-USTelligent Community 13Tue, 09 Jun 2015 06:26:51 GMThttps://devzone.nordicsemi.com/thread/26667?ContentTypeID=1Tue, 09 Jun 2015 06:26:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a4cb7855-94a0-4cc7-95b4-4b031ed1dc7c&#216;yvind Karlsen<p>Hi,</p> <p>As Dave pointed out, matching the antenna for the use-case scenario is your best bet. If you are looking for help with implementation, you should find this blogpost on <a href="https://devzone.nordicsemi.com/blogs/655/general-pcb-design-guidelines-for-nrf51/">General PCB design guidelines for nRF51</a> useful, particularily the part on tuning and selecting antenna. Also the white paper on <a href="https://www.nordicsemi.com/eng/nordic/download_resource/20347/4/95023480">Antenna Tuning</a> might be useful.</p> <p>In addition to the antennas mentioned in the blogpost you also have the opportunity to use larger directional antennas such as a yagi-derivative, or a parabola, however I suspect you might be limited by size constraints.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/26666?ContentTypeID=1Mon, 08 Jun 2015 17:33:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6735d7e2-c47f-4c1b-9435-4c425bac43a0Dave_couling<p>You can tune your antenna to compensate for the detuning that proximity to the human body will cause. However the body will still absorb signal. You best bet is a width bandwidth antenna that you can place as far away from the body as possible. Using a more directional antenna can help to as you can direct the signal away from the body.</p><div style="clear:both;"></div>