antenna matching and placed componentshttps://devzone.nordicsemi.com/f/nordic-q-a/47681/antenna-matching-and-placed-componentsIn the schematic of the nRF52840-DK L1 and C4 form the matching network. C22 is noted with NP, but on the DK i have, is a component placed. Since i would like to use the MM8130-2600 connecter aswell i am interested why the additional C22 is placed onen-USTelligent Community 13Thu, 23 May 2019 13:41:25 GMTRE: antenna matching and placed componentshttps://devzone.nordicsemi.com/thread/188854?ContentTypeID=1Thu, 23 May 2019 13:41:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7387b13b-ac43-4958-9652-9718e1cccd3dketiljo<p>The nRF52811 is different, this is using only two components. The reason that the nRF52840 is using three is because the 8 dBm mode needs more filtering of the harmonics. The nRF52811 has max 4 dBm.</p> <p>Always refer to the specific device&#39;s reference schematic in the <a href="https://infocenter.nordicsemi.com/index.jsp">infocenter</a>.&nbsp;</p><div style="clear:both;"></div>RE: antenna matching and placed componentshttps://devzone.nordicsemi.com/thread/188840?ContentTypeID=1Thu, 23 May 2019 13:18:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3c317778-1002-43f4-8723-0570d5e90146rico<p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/4113.Unbenannt.PNG" /></p> <p>My schematic of the DK looks different.</p> <p></p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/nrf52811.PNG" /></p> <p>Since i will use&nbsp;the nrf52811, i can connect the switch directly after the matching network of C3 and L1? No need for further components?</p><div style="clear:both;"></div>RE: antenna matching and placed componentshttps://devzone.nordicsemi.com/thread/188834?ContentTypeID=1Thu, 23 May 2019 13:04:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:213a896c-fd79-40f2-925e-9122cf1a06bbketiljo<p>The matching network for the nRF52840 consists of three components, C3, C4 and L1. C22 is optional:</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-0c6a2becf5cb405986a66350c1960f68/pastedimage1558616519654v1.png" alt=" " /></p> <p>C23 on the DK is used for antenna tuning, placed after the connector.</p><div style="clear:both;"></div>