https://devzone.nordicsemi.com/f/nordic-q-a/59771/general-feedback-on-hardware-design-and-antenna-placementDear Community, I am working on a project where the idea is to build a board that can measure the resistance over a small biosensor. The biosensor will be connected between GND and P0.02. The theory is to apply a small current over the resistor anden-USTelligent Community 13Fri, 03 Apr 2020 07:39:55 GMThttps://devzone.nordicsemi.com/thread/243318?ContentTypeID=1Fri, 03 Apr 2020 07:39:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:346fc9b2-8e76-4000-a3e6-33b42e54acd4Emil_Ekelund<p>Thank you for the reply, I will take a better look at antenna placment and specifications. </p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/242930?ContentTypeID=1Wed, 01 Apr 2020 11:39:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:44bd9f25-56b8-47c9-8b5a-82ffb9d46620ketiljo<p>A good start. But you need place the antenna so it&#39;s not covered by the ground plane and do ground plane under the antenna either, like this:&nbsp;</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-cb4a4da68ae84da0aa1e4422dd2fe860/pastedimage1585740169352v1.png" alt=" " /></p> <p>See if there&#39;s a recommended placement and layout in the antenna&#39;s datasheet. Very often, they will say something about the distance to ground etc.&nbsp;</p> <p>And no, the antenna will not be 50 ohm. This is rarely the case and depends on the placement, size of the ground plane etc. So you will need tuning components to tune the antenna. A pi-network is good for this, see this whitepaper:&nbsp;<a href="https://infocenter.nordicsemi.com/pdf/nwp_017.pdf">https://infocenter.nordicsemi.com/pdf/nwp_017.pdf</a></p> <p>Place this near the antenna, but still on the ground plane.&nbsp;</p> <p>If you have space for it, you can also make a 1/4 wave antenna with a track, about 23 mm long. . This have often better performance than a chip antenna and it&#39;s easier to tune. Also in the whitepaper. This can look like this for instance:&nbsp;</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-cb4a4da68ae84da0aa1e4422dd2fe860/pastedimage1585741192443v2.png" alt=" " /></p><div style="clear:both;"></div>