https://devzone.nordicsemi.com/f/nordic-q-a/72170/nrf52840-development-kit-ble-antenna-efficiencyTo the kind attention of Nordic support team, if it is not much trouble I would like to know what you consider a good/acceptable ble antenna efficiency in desktop environment (keyboards like applications). Is it 40% efficiency acceptable in your opinionen-USTelligent Community 13Mon, 01 Mar 2021 14:20:31 GMThttps://devzone.nordicsemi.com/thread/296894?ContentTypeID=1Mon, 01 Mar 2021 14:20:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c463a99f-1cee-4765-80cc-ba9ff4ad47f8astella<p>Thank you very much ketiljo for your kindness</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/296877?ContentTypeID=1Mon, 01 Mar 2021 14:10:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a03a434e-8c29-4515-826e-0bc079cfbfbfketiljo<p>The efficiency of the antenna depends on a lot of things, but the size of the ground plane is one of the most important factors. A small PCB will have less efficiency than a large one. 40% should be ok for short distance devices like keyboards etc. The antenna on the DK is isn&#39;t characterized so it&#39;s hard to tell. GIven the size of the antenna and the ground plane, the efficiency is good on this.&nbsp;</p><div style="clear:both;"></div>