How do you install a cell signal blocking system on a specific floor of a building so that it doesn't affect the upper and lower floors?

I want to install a cell phone signal jammer on a specific floor of a building. I just want the shielded signal of the cell phone signal shielding system to cover my own room and not affect the floors above and below. Can my wish be realized? ? What can be done without affecting the radio signal above or below?

The structure of the building is usually a reinforced concrete structure, and reinforced concrete is used as a barrier material between the upper and lower floors. In fact, it can have a great attenuation effect on the shielding signal of the mobile phone signal shielding system. and the greater the thickness, the greater the attenuation. The effect is bigger! According to actual test results, when the thickness of fully solid reinforced concrete exceeds 300mm, the shielding signal of the mobile phone signal shielding system can almost not penetrate.

But why do some customers report that after turning on and using the mobile signal shielding system, the radio signals upstairs and downstairs are still disturbed to some extent? In fact, it is closely related to the installation location of the mobile phone signal shielding system. After the shielding signal is emitted, it not only penetrates some obstacles, but also has reflection and refraction characteristics. If the mobile phone signal shielding system is installed close to the outside of the building, such as near a window, it is obvious that the window has little effect on shielding signal errors, and the shielded signal can be transmitted normally through refraction and refraction Reflection phenomenon can easily affect the upper and lower floors.

The solution to the problem is: The cell phone signal shielding system must be installed as close to the center of the floor as possible and as far away from the window as possible. In addition, it is best to place a wall as an obstacle between the installation location and the window to prevent the shielded signal from being radiated directly outside the building.