What is the principle of mobile phone signal shielding device?

The principle of mobile phone signal shielding device is: in a certain frequency range, mobile phone and base station are connected by radio waves, and data and sound are transmitted at a certain baud rate and modulation mode. According to the above communication principle, the shielding body scans from the low-end frequency to the high-end frequency of the forward channel at a certain speed during operation.

This scanning speed will cause garbled interference to the message signal received by the mobile phone, and the mobile phone can't detect the normal data sent by the base station, which leads to the failure of the mobile phone to establish a connection with the base station. Mobile phones are characterized by searching the Internet, no signal and no service system. In the end, there was no signal on the mobile phone, and no text messages and phone calls were received.

Extended data:

Mobile phone screen background:

In all kinds of examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, government, finance, prisons, public security, military places and other occasions, it is forbidden to use mobile phones.

When entering the above-mentioned occasions, it is forbidden to use mobile phones, but when entering the above-mentioned occasions, mobile phones will be turned on and brought in carelessly, so a technology that can shield mobile phones without affecting the use of other electronic products is urgently needed, and mobile phone shielding came into being.

Baidu Encyclopedia-Mobile Phone Signal Shielder