Many people are used to surfing the Internet anywhere, but there are signals in the city. Why do some elevators have no signal when they enter? Today Fuji Elevator Factory  came to analyze why there is no signal in the elevator?

The material of the elevator is metal, which forms an electrostatic shield so that the outdoor signal is not easy to penetrate. After the car door and the landing door are closed, the elevator will form a Faraday cage. The Faraday cage has the effect of electrostatic shielding, and the electromagnetic waves are also compared. Good shielding effect, and because the position of the elevator is often located in the center of the building, the loss of the wall is also relatively large, and because of the tunneling effect of the elevator shaft itself, special coverage is required. The elevator is a large iron box, and it is difficult for electromagnetic waves to reach the inside of the elevator.

But what if the elevator fails and the elevator cannot be rescued? In order to prevent this from happening, it is necessary to install a signal booster on the elevator car to ensure safety.