https://devzone.nordicsemi.com/f/nordic-q-a/33679/using-nrf51-dongle-antenna-with-nrf52810I plan on using the nRF51 Dongle meandered antenna for a design involving the nRF52810. Since the nRF52810 has an internal balun, does that mean that L1, L2, C5, C4, L3 and C6 in dongle design are all not required for my case? If some of them are requireden-USTelligent Community 13Mon, 23 Apr 2018 13:51:51 GMThttps://devzone.nordicsemi.com/thread/129369?ContentTypeID=1Mon, 23 Apr 2018 13:51:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38f245f6-a65b-4f49-9521-0bbae4950674Andreas<p>Hi,</p> <p>&nbsp;</p> <p>Both nRF52832 and nRF52810 do indeed have single-ended outputs, but they require two external components (see the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52810.ps/ref_circuitry.html?cp=2_2_0_6_2_0#concept_hqh_j22_fq">reference circuit</a>) for harmonic rejection and to some extent impedance matching. If you plan on&nbsp;backing off on output power you <em>might</em> be fine with only the pi network for antenna tuning, but for the higher power settings you need them. Regardless, you should<strong> always</strong> measure this on your prototypes and tune the matching network accordingly, or you risk failing regulatory tests.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>