https://devzone.nordicsemi.com/f/nordic-q-a/76116/matching-circuithello I am using ufl(U.FL-R-SMT(01)) 50 ohm antenna My question is: is the matching circuit listed in the picture sufficient or do I need another componenten-USTelligent Community 13Wed, 07 Sep 2022 14:54:10 GMThttps://devzone.nordicsemi.com/thread/385078?ContentTypeID=1Wed, 07 Sep 2022 14:54:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c42b955e-5c5d-4acd-8997-b113d4284af4Veronica<p>To do the antenna tuning, should we remove the balun matching network? And a capacitor should be placed between the coaxial cable and antenna network matching? is this only for impedance measurement? Should be the PCB bare?</p> <p></p> <p>when we connect the VNA to an assembly device should be all the&nbsp;matching networks connected?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/314330?ContentTypeID=1Wed, 09 Jun 2021 06:04:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b38a1e3-11a3-4de9-ba00-e0eabbe487fbmustafa.muna<p>thank you very much</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/314132?ContentTypeID=1Tue, 08 Jun 2021 09:09:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f66632de-1c66-4dd7-84e7-133472067bedBendik Heiskel<p>Hi.</p> <p>A PI matching network is recommended for the nRF52840, so an shunt capacitor should be added between L1 and the connector .</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1623142841494v1.png" alt=" " /></p> <p>The footprint of a additional capacitor is added in the nRF25840DK, this capacitor is optional but nice to have if the connector and antenna needs tuning.</p> <p></p> <p>Best regards,</p> <p>Bendik Heiskel</p><div style="clear:both;"></div>