The current demand for mobile phones is very high, almost every person has one. And in some places, there is no need for this, leading to the derivation of signal shielding products. How these products interfere with communication signals? Firstly, we need to understand how communication signals are transmitted. When we use a mobile phone for a call, we use the uplink frequency to contact the base station, and then the signal from the base station passes through the operator to the mobile phone to achieve the call function. In standby mode, the phone still maintains contact with the base station through the uplink signal. Once there is a call demand, the phone can achieve call and information transmission functions through the operator at any time. The RF jammer is a device that interferes by sending the same signal frequency as this. If the mobile phone shows a no signal state when using an RF jammer, it is considered successful interference. Nowadays, with the increasing number of mobile phone users, it is inevitable that some places prohibit making calls, sending messages, and accessing the internet, and radio frequency interference machines have become very useful tools in these places.

Nowadays, RF jammers can not only interfere with communication signals, but also interfere with different signals such as GPS and WLAN, mainly depending on the site requirements. There are various types of shielding devices currently sold on the market, some of which can interfere with single ended signal frequencies, while others can simultaneously shield multiple signal frequency bands. The former has a single interference frequency band and has a significant effect on individual signals, while the latter has a complete range of interference signals and can interfere with most common signals.