https://devzone.nordicsemi.com/f/nordic-q-a/89411/prototyping-pcb-nrfHi, I&#39;m a student and this is my first project on RF. I&#39;m prototyping my own custom board. I did read in the papers of the quarterwave 2.45 GHz antenna that the PCB should be fabricated on a 1.6 mm FR4 substrate. Also does it says that the typical dielectricen-USTelligent Community 13Tue, 28 Jun 2022 13:15:14 GMThttps://devzone.nordicsemi.com/thread/374554?ContentTypeID=1Tue, 28 Jun 2022 13:15:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a2e37fa0-4668-49ea-ac95-e64ac82c2586Kaja<p>This can vary, and it&#39;s okay if it&#39;s not 4.4.&nbsp;<br /><br />you just have to make sure you use your numbers when you calculate the impedance of the RF path in your design. Making sure the RF path, form radio to antenna, is a 50 Ohm transmission line, a coplanar waveguide.&nbsp;<br /><br />You can use a calculation tool like AppCad to do this.&nbsp;<br /><br />Best regards,<br />Kaja</p><div style="clear:both;"></div>