https://devzone.nordicsemi.com/f/nordic-q-a/16928/minimum-antenna-impedanceI am using the nrf51822-QFAC-R in an application where the realization of the antenna is very challenging, and I expect to have an antenna |S11|=-1dB, with variations of the impedance depending on the final use case, so I can not design a matching networken-USTelligent Community 13Mon, 10 Oct 2016 08:37:08 GMThttps://devzone.nordicsemi.com/thread/64895?ContentTypeID=1Mon, 10 Oct 2016 08:37:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1dcb6ec0-741d-4c0c-864f-47737d6c9b01FormerMember<p>Almost no matter what you do, you will always get a range of 10 cm. However, the matching network in the reference layout serves multiple purposes: match the chip to 50 and damp harmonics and RX LO while keeping the output power good.</p> <p>A lot of reflections caused by bad matching will not create any problems for the PA, but the modulation characteristics may change a little. Other than that, the chip will work normally.</p><div style="clear:both;"></div>