Using signal jammer to shield wireless signals in secret places is a basic security measure. However, the development of mobile communication technology and the construction of mobile networks have brought great challenges to the shielding of wireless signals in secret-related places, which are mainly manifested in: Mobile communication and wireless systems adopt a variety of advanced anti-interference technologies. Such as: spread spectrum, frequency hopping, diversity, advanced coding, anti-interference ability is getting stronger and stronger; the same place is covered by wireless signals of multiple mobile communications and wireless systems, each system uses multiple frequency bands, resulting in more and more frequency bands , The bandwidth is getting wider and wider; Indoor base stations are widely deployed to greatly improve the indoor signal strength. However, most of the current wireless signal jammers use sweep-frequency interference methods, which require a high interference signal ratio. These factors all cause the jammer to require a high transmit power, and the effective interference radius is small.
In addition, because the potential risks of jammer signals to the human body have received widespread attention, in many cases, participants are reluctant to use jammers; at the same time, since the mainstream broadband mobile system in China is a time division duplex system, the current jammers are serious The ground affects normal communication. In response to these problems, this paper studies the impact of electromagnetic radiation non-thermal effects on human health, analyzes the relationship between the transmission power of the jammer, the minimum safety distance and the effective interference radius, and proposes the concept, working principle and application principles of the green jammer Develop the prototype system of LTE green jammer and study its feasibility through field test.
