Is there an upper limit to the shielding distance of mobile phone shielding devices? If so, what is the upper limit?

What is the maximum shielding distance of a mobile phone signal jammer?

Many users who buy and use mobile phone signal jammers often ask about the shielding distance, hoping that one or two devices can cover a larger area, even in an open area. This raises a question: Is there an upper limit to the shielding distance of current mobile phone signal jammers, and if so, what is the upper limit?

People familiar with Cell Phone Jammers know that the effective shielding distance, especially the effective shielding distance of 5G signals, is closely related to the environmental signal strength at the place of use. Specifically, it depends on the distance between the 5G base station and the site. If the site is more than 1 km away from the 5G base station, the range of the mobile phone signal jammer will be large, and the effective shielding radius can reach tens of meters. However, if the 5G base station is only a few hundred meters away, the effective distance of the jammer will be much shorter, perhaps only one to twenty meters. When the 5G base station is less than 200 meters away, the situation is even more difficult, and it is difficult for traditional low-power mobile phone jammers to play an effective shielding role, with a shielding radius of only 1-2 meters.

From the above analysis, it can be seen that the upper limit of the shielding distance of the mobile phone jammer is related to the distance between the on-site environment and the surrounding base stations. In addition, there are two influencing factors: the RF transmission power of the jammer and the type of antenna.

First, let’s analyze the first point. Common sense tells us that the greater the transmission power, the longer the effective distance. At present, the maximum RF power of a single-band module is about 100-200W, corresponding to an effective distance of about 200-500 meters. Best-selling WIFI jammers and GPS jammers in Europe and America.

Next, let’s analyze the second point. The choice of antenna used in the mobile phone jammer is also very important. Using a high-gain directional antenna will undoubtedly extend the effective shielding distance compared to a low-gain omnidirectional antenna. However, while the directional antenna increases the shielding distance in the target direction, it sacrifices a considerable part of the effective shielding range in the side and rear directions.

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