Talking about Mobile Phone Signal Blocking

Due to the development of communication technology, personal mobile communication has brought convenience to people's lives, and the impact of blocking mobile phone signals on similar occasions such as prisons and detention centers is becoming increasingly prominent. Once mobile phones are illegally brought into prison and put into practice, it will bring great harm to the management and security of prisons, detention centers, and other places. So establishing a truly effective mobile phone blocking system can provide strong technological support for prisons and detention centers.
However, due to the current mixed market, many cheap mobile phone blockers are mainly suitable for general civilian use due to limitations such as performance indicators, reliability, and operating conditions. In large places such as prisons and detention centers, there may be certain problems, such as external interference, and some may even seriously affect public communication.
Why does the mobile signal blocker uniformly purchased by the Provincial Prison Administration cause such significant interference to the surrounding public communication? Below, I will analyze a bit. If there are any shortcomings, I hope you can correct them
1. Technically speaking, the shielding of mobile phone signals is actually just a small branch of wireless information shielding systems. Its essence is electronic countermeasures, also known as co frequency interference, which uses devices to emit high-frequency signals through the antenna, causing the mobile phone to generate errors when receiving downlink signals, making it unable to recognize and connect to the network. The mobile phone displays as no network status, meeting the requirements of signal shielding;
2. For the blocking of mobile phone signals, everyone knows that it is necessary to interfere with the downlink. However, due to a series of factors such as technological cost, price, and production, it is difficult to only interfere with the downlink. Therefore, some unscrupulous manufacturers do not make precise frequency range adjustments to improve the interference effect, resulting in some interference energy to the uplink. This can greatly improve the interference ability and have a crooked effect, but it sacrifices the public interest;
3. The mobile phone signal in the same room may have significant changes at different locations and times, and can reach around 10dBm based on actual experience. In terms of conversion success rate, there is a difference of 10 times. From this, it can be seen that mobile phone signal blocking is actually a highly technical project that cannot be solved simply by purchasing a blocking device and installing it yourself. The on-site survey, power calculation, construction design, and equipment debugging are all complementary and inseparable.
4. As a prison procurement and installation of over 300 mobile phone signal shields, from a professional perspective, there are significant problems. When signal shielding is required in a large and complex environment, a high gain antenna with a large range of shielding combined with a small range of indoor antenna leakage points should be used for shielding. The angle of the antenna and the power of the equipment require professional personnel to configure and debug, in order to achieve strict shielding in the prison High quality effects without interference outside of prison. Short term signal shielding within the school can be achieved using high-quality low-power portable shielding devices or temporary antenna placement methods.