a way to optimize signal strength

[junsoo337]

hi, i'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 )

Who are you ever experienced this? how can i optimize it?

thanks~~~

[Øyvind Karlsen]

Hi,

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 General PCB design guidelines for nRF51 useful, particularily the part on tuning and selecting antenna. Also the white paper on Antenna Tuning might be useful.

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.