https://devzone.nordicsemi.com/f/nordic-q-a/29346/nrf52xxx-safe-to-use-dual-band-wifi-antennaHello, I imagine this is a pretty common and basic question but I couldn&#39;t find anything online. Since the nRF52xxx chips are single-band 2.4GHz (and possibly sub-GHz also), is it advisable to use a Dual-Band (2.4GHz + 5GHz) WiFi Antenna as theen-USTelligent Community 13Thu, 11 Jan 2018 18:24:44 GMThttps://devzone.nordicsemi.com/thread/116746?ContentTypeID=1Thu, 11 Jan 2018 18:24:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:552f3ed8-efca-4526-81a0-1437274db24aDave_couling<p>Couldn&#39;t you potentially run into 2nd harmonic issues during certification?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/116747?ContentTypeID=1Thu, 11 Jan 2018 15:34:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:96b3f037-b5e1-4188-8f2d-421a1d8f7701seth<p>Great. The reason I want to use the antenna is simply because of it&#39;s form factor. A lot of antennas are coming out these days that are not simply single-band but are dual-band and sometimes have superior qualities. So as long as the unused band doesn&#39;t cause too much interference, then I think we will go ahead and use it.</p> <p>Thanks, Seth Berggren</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/116745?ContentTypeID=1Thu, 11 Jan 2018 11:09:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a3d0bded-0b1b-4e6f-adca-e93c7ab5dd36Hung Bui<p>Hi Seth,</p> <p>I checked with our RF expert. It should be ok, the matching network should be able to surpress 2nd harmonic.</p> <p>Is there any particular reason why you want to use the dual band antenna ? Do you plan to combine it with a wifi module ?</p><div style="clear:both;"></div>