| 摘要 |
PURPOSE: A jamming system is provided to transfer a signal having reverse phases of a same frequency band and reception frequency of a cellular phone. CONSTITUTION: A jamming system comprises an oscillator, a controller, an amplifier, a filter, and a directional antenna. The oscillator oscillates a plurality of reverse phase frequency so that a cellular phone and a signaling sound of a pager can not be operated in regular regions. The controller controls signal output of the oscillator and a signal delivery band. The amplifier amplifies frequency affecting the cellular phone and the pager within a regular scope, according to a control signal of the controller. The filter filters frequency so that the output signal of the amplifier can not affect other electronic apparatuses. The directional antenna decides a direction so that offset frequency passed through the filter can affect the cellular phone and the pager within a regular angle and the regular scope. |
