A customer described such an application scenario: the high-power frequency jammer is installed on the ground, and the target area to be interfered is located above the tenth floor of the building. Under such conditions, is there any interference effect?
In such a use environment as mentioned by customers, the selected high-power frequency jammers are generally portable frequency jammers with a drag-box structure, usually equipped with an omnidirectional antenna, although its RF transmission power is very large. , but since the antenna is screwed on the trailer, the height of the antenna from the ground is only 1-2 meters. As a result, the height of the floor that the interference signal can effectively interfere with is basically unable to reach the 10th floor, or even Can not reach the height of more than 6 floors. This is because in the process of transmitting the signal to each floor, the interference signal that enters directly through the door or window will have a better interference effect. In the transmission path of the signal, it will be attenuated by various obstacles. Although some interference signals will be transmitted to the inside of the building through refraction and reflection, the signal strength of the frequency jammer at this time is already very weak, and its signal strength is already very weak. It is not enough to completely suppress the mobile phone signal, etc., so that the effect of the interference signal is lost.
Although some customers have suggested that replacing the omnidirectional antenna with a directional antenna can enhance the interference effect? The result of this is that the interference effect on the lower floors is strengthened and improved, but for the high floors, it is also due to the attenuation of the obstacles, and the replacement of the directional antenna has almost no enhancement effect.
In fact, for the target area above the tenth floor of the building, if you want to achieve a good interference effect, the solution needs to be synchronized in multiple ways. For example, multiple high-power frequency jammers need to be installed around the building at the same time, the antenna installation height of the frequency jammer needs to be raised, and the distance between the frequency jammer and the building needs to be correctly evaluated. To install a frequency jammer on a selected floor, only after multiple methods are applied at the same time, it is possible to truly solve the problem of signal jamming effect in buildings with more than ten floors.