Signal disturbance of ESP32-S3 module with pcb wifi antenna underneath a metal plate

[Baldhead]

Hi,

I would like to know if a lcd with back metal plate will decrease the wifi signal of an esp32-s3 module.

I think so, but it doesn't hurt to ask.

In annex follow a side cut image what I want to do.

Thank's.

[ESP_Sprite]

That will likely negatively affect antenna performance, yes. Sorry, I don't know too much about RF magic to give an indication of how much. Another thing you may want to watch out for that I've had issues with in the past: if you manage to detune your antenna by a lot, you can get issues on WiFi initing where the calibration suddenly requires a lot more power causing a brownout.