topic Re: Shielding PN5180 in NFC

Shielding PN5180

AlanSbor — Mon, 19 Apr 2021 18:45:11 GMT

Greetings to all residents of the forum.

Assembled the device in a bundle of ESP32 + CPU2104 + PN5180

General view of the device.

Power supply is stable, no noise or float. PN5180 - works at 3.3V.

Everything worked well on the mecket, but as soon as I began to carry out tests on my printed circuit board, it turned out that the interference from the PN5180 was very large.

The antenna is taken out through the connector separately. It was assumed that it would be possible to attach it to the bottom of the main board, but the labels are not readable even when tight to the antenna. At a distance of about 8-10 cm, they are read without problems.

I set up the RF section for the NXP soft program, but this did not solve the problem.
What can be wrong ?

An aluminum screen without a ground wire connection did not solve the problem.

I want to try shielding the radio with 3M 1194 shielded copper non-conductive tape.
Can anyone come across a similar one? Where to look ? What to re-read again?

Maybe there are recommendations from the shielding NXP company itself.

Re: Shielding PN5180

fangfang — Tue, 27 Apr 2021 06:06:49 GMT

Hello,

On PCB, the bottom of filter circuit and matching circuit must be cleared. That's, you can't lay out the parts.

Please confirm it. Hope it help you.

Have a nice day.

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Re: Shielding PN5180

AlanSbor — Tue, 27 Apr 2021 16:58:01 GMT

Hello,

I did not quite understand. Please tell me according to the scheme, what is wrong with it?

What part of the schema do you propose to clean and split?

I am attaching the diagram.

Re: Shielding PN5180

fangfang — Wed, 28 Apr 2021 01:49:56 GMT

Hello.

Thanks for your update information. For the detail information please refer to the videos as the links.

URL:

https://www.nxp.com/video/nfc-antenna-design-2-antenna-matching:ANTENNA-MATCHING-VIDEO

https://www.nxp.com/video/nfc-antenna-design-3-metal-environment:ANTENNA-METAL-ENVIRONMENT-VIDEO

https://www.nxp.com/video/nfc-antenna-design-4-optimization-debugging:ANTENNA-DEBUGGING-VIDEO

Have a nice day.