Abstract:
Communication jamming devices were firstly developed and used by the military to gain the control over electromagnetic wave spectrum while denying the friendly use of enemies' radio frequency (RF) communication.
At present the mobile phone jammer devices have become civilian products rather than electronic warfare devices. With the increasing number of the mobile phone users the need to dis- able mobile phones in specific places where the ringing of cell phones would be disruptive has increased. These places include worships, university lecture rooms, libraries, concert halls, meeting rooms, and other places where silence is appreciated. Conference halls and lecture halls are the ex- ample for places where a mobile jammer would be a great solution, although organizers or lecturers ask respectfully from the audience to disable their mobile phones during the conference or lecture, some people forget and the ringing of their mobile phones become very annoying especially during the conference or lecture time. Other than that, we can use the mobile phone jammer at places like prisons where mobile phone use is strictly prohibited. Moreover, there is high probability of secret leakage of defence meetings using technological means to target high value item or for terrorist activities.
Conventional mobile phone jammers emit signals on the same frequency at which a GSM system operates, and there by disables mobile phones operating in the area where a jammer operates. However, continuous emission of electromagnetic waves can be harmful for health of the people in the particular area. There for our research has designed a smart jammer which identify the presence of a mobile phone and emit electromagnetic wave only when a mobile phone seems is attempted to be used. So while helping to reduce health hazards caused by conventional jammers. The smart phone jammer drastically reduces the power consumptions required for operates.
