With the continuous development trend of modern science and technology, mobile phones supporting 5g signals have become popular. While 5g technology has an impact on people's lives, we should pay more attention to the data leakage problem caused by 5g mobile communication technology. Especially in some places where the use of mobile phones is prohibited, such as secret related organs, scientific research institutions, detention centers, college entrance examination halls and other unique places, more regulations have been made on the technical nature of mobile phone signal interference. In order to ensure that these places will not have negative effects due to the use of mobile phones, it is necessary to select signal jammers to carry out the work of interfering with mobile phone signals. As the most critical place, mobile phone detection and interference with the working environment, for example, it eliminates many potential safety hazards that disturb discipline in the examination room, and enables students to ensure that no micro communication equipment can be brought into the examination room when they enter the examination room. Even if they are lucky enough to enter the examination room, they can not communicate or access the Internet regularly, so that all students can compete in a fair and just condition.

The principle of signal jammer is not very difficult. As one of the most important communication devices in mobile communication technology, mobile phones must first establish a connection with the nearby base stations, and then connect the base station equipment to find the communication destination station. In the whole process above, all information contents are installed and transmitted according to radio waves. The commonly used radio wave frequency band of mobile phones is in the range of 850-4900mhz. The Signal Jammer can achieve the purpose of jamming only by targeting this frequency range.