Can changing to three-sided directional antennas increase the shielding distance?
In order to maximize the shielding distance and shielding effect of high-power cell phone signal jammers, some customers use omnidirectional antennas with high-power mobile phone signal jammers. After adopting this approach, the coverage area of the blocked signal is an area with the mobile phone signal jammer as the center and a radius of tens or even hundreds of meters. However, some customers' sites are very open and occupy a large area. At this time, they particularly hope that the coverage radius of the shielded signal can be further improved, so a suggestion is made: change the omnidirectional antenna into a directional antenna, and each antenna Directional antennas are responsible for 120-degree sectors, which combine to form complete 360-degree coverage. Because the gain value of a directional antenna is much greater than that of an omnidirectional antenna, it can be inferred that the shielding effect can be improved simply by replacing the antenna.
Is this really the case? The result is regrettable. The gain of directional antennas is very high. But because three directional antennas need to be used, the mobile phone signal jammer, as a signal source, needs to provide signals to three directional antennas at the same time, which requires the use of a power splitter (power splitter, one in and three out). This is actually It is to divide the output power of the mobile phone signal jammer into three equal parts. In addition, it should be noted that due to the addition of power distribution links, the power attenuation of some RF adapters and RF cables during transmission will also be increased.
The final result is: if you really replace the high-power mobile phone signal jammer with its original omnidirectional antenna and three directional antennas, you will find that the actual shielding effect cannot be significantly improved, or even There will be a decrease.
