https://devzone.nordicsemi.com/f/nordic-q-a/1266/matching-nrf24l01-to-unusual-antenna-40-j48Hi! I must match NRF24L01 to 40+j48 ohm antenna. This is not my design, so no possibility to change. I have PCB antenna, that was measured to be 40+j48 inside enclosure. So I have some questions: Is it correct to assume 15-j88 ohm porten-USTelligent Community 13Mon, 06 Jan 2014 16:08:20 GMThttps://devzone.nordicsemi.com/thread/5824?ContentTypeID=1Mon, 06 Jan 2014 16:08:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a3f018d1-977b-4f76-86bf-28c5c8e80f3fH&#229;kon Alseth<p>Hi,</p> <p>That is not going to be an easy task. Our radio&#39;s uses a reference matching network w/50 ohm single ended output. This also includes a high-order filter to suppress harmonics and spurious. Changing this output impedance is going to give you a head-ache in terms of teleregulatory compliances (FCC/ETSI etc) and performance.</p> <p>A better approach will be: What I suggest that you do is to insert a <a href="http://en.wikipedia.org/wiki/Antenna_tuner#Pi_network">PI-network</a> to tune your antenna into 50 ohms using a network analyzer.</p> <p>Best regards Håkon</p><div style="clear:both;"></div>