Luckily, compared with the main energy, the leaked energy is small. The diversity gain also can be got through the polarization diversity of antenna of cell phone jammer. The biggest advantage of the polarization diversity antenna lies that only a pair of antennae is needed to be installed so that the installation cost can be saved.
•Influence from architectural layout in the prison
The scale, building amount, structure, and size and floor height of every prison are different. The direction, power, topography and so on of every base station near the prison are different. Therefore, the cell phone signal strength transmitted from the base station is different and the position distribution of the 3g cell phone jammer system in the prison should be designed according to the actual site situation.
Even in the same environment, the field strength of signal will fluctuate for the base station signal will be influenced by wind, relative humidity and so on. Besides, the field strength difference between the indoor space and outdoor space, ground, architectural structure, material and metallic products will complicatedly and harmfully influence the cell phone jammer system.
The polarization phenomenon of the electromagnetic wave has been introduced previously. The polarization antenna of the cell phone jammer has been widely used in more and more projects. The antenna can carry two kinds of signals through two kinds of polarization-horizontal polarization and vertical polarization.
Theoretically, for the media will not introduce the coupling influence, the mutual interference will not be caused. But in the mobile communication environment, the cross coupling effect will happen, which means that energy of vertical polarization wave will leak to the horizontal polarization wave after the signal is transmitted by the mobile radio medium and vice versa.