Wireless communication must ensure sufficient carrier-to-interference ratio (signal-to-noise ratio) in order to receive effectively and complete communication. The mobile communication device destroys the reception conditions of the mobile phone and cuts off the communication connection between the mobile phone and the base station by generating interference signals of the same frequency as the mobile phone. To achieve the effect of shielding communication.
The jamming power of the signal jammer is fixed, and the shielding radius of the unobstructed space is determined by the path attenuation and the signal level of the receiving base station. The following table shows the comparison table of distance and path attenuation. Then the coverage radius can be determined by the output channel power of the jammer, the base station signal level, and the coverage line gain.