https://devzone.nordicsemi.com/f/nordic-q-a/26634/nrf52840-2-layer-pcbHello Just to confirm: is it OK to use 2-layer PCB with nRF52840? In case a 4-layer is needed, when do you advise the use of a 4-layer pcb? Basically we&#39;ll have the chip + accelerometer/gyro + lipo charger + SPI FLash on a chip of maxen-USTelligent Community 13Mon, 06 Nov 2017 14:59:37 GMThttps://devzone.nordicsemi.com/thread/104777?ContentTypeID=1Mon, 06 Nov 2017 14:59:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:89577392-dfa7-4fd3-824c-549ff91a2dfaJ&#248;rn<p>Hello Chevyan</p> <p>Using a 2 layer PCB is OK. A 4 layer PCB will give more freedom when it comes to routing your traces and can make it easier to maintain unbroken ground-planes where needed. Prices are typically higher for multi-layer PCB&#39;s.</p> <p>It is important the RF section has solid ground and is dimensioned properly. Typically you would design RF traces as transmission lines or co-planar waveguides with solid ground underneath. With a multi-layer pcb you could also design them as striplines (completely embedded in the dielectric). The antenna should have a large solid ground plane covering it at least one side. I suggest you read <a href="https://devzone.nordicsemi.com/tutorials/35/">this blogpost</a> for PCB guidelines for the nRF52.</p> <p>Best regards</p> <p>Jørn Frøysa</p><div style="clear:both;"></div>