This is a proof of concept based on the Ghost Touch attack that seeks to show its effectiveness in Xiaomi smartphones.
To perform the attack you need a copper plate (printed circuit board can be used), a function generator and an oscilloscope to check the generated frequencies.
The positive pole of the function generator is connected to the copper plate acting as an antenna.
In the Xiaomi Mi5s Plus smartphones were observed anomalies in their touch screen from 198Khz to about 203Khz.
This study was based on Seita Maruyama's lecture presented to the IEEE Symposium on Security & Privacy 2019 - link: https://www.youtube.com/watch?v=phuiwh7djQMThe video below presents the proof of concept: