https://devzone.nordicsemi.com/f/nordic-q-a/53744/microstrip-impedance-of-50-ohm-pcb-antennaI&#39;m looking at reference schematic/layouts for the NRF52840 and fail to see how the PCB antennas are 50 ohms. (I understand that it&#39;s frequency dependent, and that resonant frequency is a function of length. I&#39;m referring to the characteristic impedanceen-USTelligent Community 13Thu, 31 Oct 2019 09:21:18 GMThttps://devzone.nordicsemi.com/thread/217709?ContentTypeID=1Thu, 31 Oct 2019 09:21:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:34472ffd-a671-4f74-8f07-d20c2c6ac68aJared<p>Hi,</p> <p>Calculators doesn&#39;t always give an accurate result of how it really is. You would have actually measure on the circuit with a Network analyzer to get an accurate result. Which is what we have done with the reference design.&nbsp;The matching network in the reference design has been measured and tuned to the antenna so that it&#39;s 50 ohm. Without the capacitor it would be around 30 ohm.</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>