Every year during the college entrance examination, the school will have network problems such as mobile phone disconnection and slow Internet speed. That is because the school has opened a mobile phone jammer.
If we think of a mobile phone as a handheld two-way radio, the radio can be interfered, and the mobile phone is no exception. Like any radio, the signal of a mobile phone will be interfered.
Interfering with mobile phones is like interfering with any other type of radio communication. The mobile phone communicates with its service network through the base station. When mobile phone users drive down the street, the signal is switched from one base station to another.
We know that wireless communication uses electromagnetic waves for communication. The functional characteristics of electromagnetic waves are determined by their frequency.
The basic principle of cell phone jammer equipment is to emit the same radio frequency signal as the mobile phone. Because the frequency is the same, the mobile phone cannot distinguish which signal is a regular base station signal, thus realizing "interference". As long as there is a machine with the same frequency as the phone, when the base station tries to connect to the phone, it will make a lot of "noise". You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone.
At present, the main principle of signal shielding and signal jamming is to emit huge noise in the frequency band used by mobile phones, which interferes with the reception and transmission of normal signals of mobile phones. This small object is not only often used to prevent cheating in exams, but also politically and militaryly to prevent terrorist attacks. However, signal jammers are not like shopping for food, they are not bought and used casually, otherwise they may be illegal.
