https://devzone.nordicsemi.com/f/nordic-q-a/122411/nrf54l10-pcb-layout-with-antennaHello, i have a question about antenna on PCB, the datasheet show me Grounding of C9 capacitor MUST be isolated from ALL ground layers except the bottom ground layer, I see the PCB example, Antenna reference layer is buttom layer, but my PCB is four layersen-USTelligent Community 13Fri, 20 Jun 2025 12:11:41 GMThttps://devzone.nordicsemi.com/thread/540018?ContentTypeID=1Fri, 20 Jun 2025 12:11:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d749bea5-84e2-4162-a09b-f8d5b3829980mathiaso<p>Hi.</p> <p>If you don&#39;t have the cut-out beneath the RF trace in the inner layers found in the <a href="https://www.nordicsemi.com/Products/nRF54L15/Reference-layout?lang=en#infotabs">reference layout</a>, and instead use the second layer as the ground reference layer, the best is probably to connect the C9 grounding to the second layer too. However, if you&#39;re able to, it is recommended to include the cut-out.</p> <p>Best regards,<br />Mathias</p><div style="clear:both;"></div>