https://devzone.nordicsemi.com/f/nordic-q-a/18155/pca10000-using-with-another-pcb-stackHello! I am designing PCA10000 based PCB. Unfortunately my manufacturer can&#39;t make PCB using prepegs and cores that used in PCA10000 (4.4 and 4.8). They can make using 4.6 core and 3.9 prepreg. So, it seems I need redesign PCB project? What is the besten-USTelligent Community 13Mon, 05 Dec 2016 12:16:20 GMThttps://devzone.nordicsemi.com/thread/70067?ContentTypeID=1Mon, 05 Dec 2016 12:16:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:16f965e7-05b4-485e-a2de-eb46a563ea3fFormerMember<p>The reference layout was made so that it should be independent of the stack-up. As you can see on PCA10000 (nRF51), the ground layer used for the chip and the matching network is the bottom layer. The reason is that when using a discrete matching network for the chip, there needs to be a distance between the chip/matching network and ground. With the stack-up used on PCA10000, the distance between layer 1 and layer 2 is very short. If using layer 2 as the ground layer it will affect the radio because of parasitic capacitance and result in lower output power.</p> <p>Therefore, in your case, you should just copy the reference layout, and make sure to have some distance between the chip/matching network and ground. Also, under the matching network there should be ground. It means that the inner layers in that region should have a keep-out region under the matching network.</p> <p>The antenna has a matching network (C14, R17,L4). The values of the matching network components were found during tuning to make the impedance of the antenna 50 Ohm.</p><div style="clear:both;"></div>