How to use a Murata u.FL MM8130 connector to adjust the impedance matching network between the nRF52 SoC and the ceramic antenna

RE: How to use a Murata u.FL MM8130 connector to adjust the impedance matching network between the nRF52 SoC and the ceramic antenna

mathiaso — Wed, 22 May 2024 07:31:02 GMT

[quote user="gabrielcbrito"]What do you mean by prototype enclosure? Like a metal shield around the nRF52 SoC and all the necessary passive components like capacitors, crystal, etc.?[/quote]

I'm just thinking of the casing of your design, to make sure everything is similar when tuning as when the design will be used for its purpose.

[quote user="gabrielcbrito"]I did not know that. Thanks for mentioning this. Great to know.[/quote]

You're welcome! :)

RE: How to use a Murata u.FL MM8130 connector to adjust the impedance matching network between the nRF52 SoC and the ceramic antenna

gcb — Tue, 21 May 2024 15:27:02 GMT

[quote userid="117796" url="~/f/nordic-q-a/111349/how-to-use-a-murata-u-fl-mm8130-connector-to-adjust-the-impedance-matching-network-between-the-nrf52-soc-and-the-ceramic-antenna/485185"]Just make sure that your radio isn't transmitting when you're measuring the antenna, as some power transfer might happen even if the internal connection is open, due to radiation. [/quote]

Yes, to tune the antenna using a VNA I will make sure the PCB is turned off.

[quote userid="117796" url="~/f/nordic-q-a/111349/how-to-use-a-murata-u-fl-mm8130-connector-to-adjust-the-impedance-matching-network-between-the-nrf52-soc-and-the-ceramic-antenna/485185"]Also make sure to include your prototype's enclosure when tuning the antenna, as this is likely to impact how it resonates.[/quote]

What do you mean by prototype enclosure? Like a metal shield around the nRF52 SoC and all the necessary passive components like capacitors, crystal, etc.?

[quote userid="117796" url="~/f/nordic-q-a/111349/how-to-use-a-murata-u-fl-mm8130-connector-to-adjust-the-impedance-matching-network-between-the-nrf52-soc-and-the-ceramic-antenna/485185"]beware that we offer a free-of-charge tuning service to our customers.[/quote]

I did not know that. Thanks for mentioning this. Great to know.

RE: How to use a Murata u.FL MM8130 connector to adjust the impedance matching network between the nRF52 SoC and the ceramic antenna

mathiaso — Tue, 21 May 2024 14:52:15 GMT

Hi, gcb.

Your thoughts are right. Just make sure that your radio isn't transmitting when you're measuring the antenna, as some power transfer might happen even if the internal connection is open, due to radiation. Also make sure to include your prototype's enclosure when tuning the antenna, as this is likely to impact how it resonates.

If you do not want to tune your radio and antenna yourself, beware that we offer a free-of-charge tuning service to our customers.

Best regards,
Mathias