nRF52840 ANT output impedance matching method

RE: nRF52840 ANT output impedance matching method

ketiljo — Thu, 02 May 2024 07:33:01 GMT

Yes, you need to send it to Nordic. You need to follow the reference design, no exceptions. Open a new private case and post the design there, schematic and gerber files.

RE: nRF52840 ANT output impedance matching method

Hiep Le — Thu, 02 May 2024 07:07:55 GMT

Hi ketiljo,

Thanks for your support.

If I want to use the antenna tuning service from Nordic, what I need to do? Do I need to send my hardware to Nordic company? and how is the process for this service?

Best regards

Hiep Le

RE: nRF52840 ANT output impedance matching method

ketiljo — Mon, 29 Apr 2024 13:16:11 GMT

You need to make sure that the impedance transformation is correct and that the low pass filtering of the harmonics are sufficient. The by far easiest is to use the reference design, btu if you deside to spend some time on this, you need to measure the output power and the harmonics in addition to S11, seen into the matching network from the antenna side with the radio in TX mode. Aim for ~60 to 70 ohm here.