https://devzone.nordicsemi.com/f/nordic-q-a/96040/nrf5340-bluetooth-antenna-issueI am working on a wearable device and using NRF5340 SoC. I am confused about Bluetooth communication. Do I have to use external antenna for Bluetooth data transmission or NRF5340 has built-in Bluetooth transvers in the chip? If I have to use externalen-USTelligent Community 13Thu, 26 Jan 2023 08:36:34 GMThttps://devzone.nordicsemi.com/thread/406586?ContentTypeID=1Thu, 26 Jan 2023 08:36:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1976a20d-8581-4529-a5ae-dd703684572dRaoul<p>Hi Zunuran,</p> <p>The nRF5340 definitely has a built in 2.4 GHz radio with BLE support, all our nRF devices do.</p> <p>Yes, you will need an external antenna, which is usually either a PCB antenna (a trace in the PCB), or a chip antenna. You&#39;ll also need some external components for the antenna&#39;s so called &quot;matching circuit&quot;. Please see my colleague&#39;s comprehensive answer for an overview on antenna selection: &nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/72960/matching-network-and-antenna-selection/300658">RE: Matching network and antenna selection</a></p> <p>Once you make a selection, you can find reference values for the matching circuit <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf5340%2Fchapters%2Fref_circuitry.html&amp;cp=3_0_0_8_2">in our Infocenter</a>. Nordic can also help with reviewing your hardware design, and with tuning your antenna and the matching circuit components.</p> <p>Best regards,</p> <p>Raoul</p><div style="clear:both;"></div>