What s the deal with no signal in the elevator? What is the principle?

Mobile phone signals are electromagnetic waves, while metal conductors can absorb electromagnetic waves; The elevator is an amplified iron box, and the iron box absorbs the signal and converts it into other energy outside, and it cannot receive the signal with a mobile phone inside.

It has nothing to do with the elevator shaft, it is the car that shields the signal, and now the general elevator is installed with the ** device of Unicom and China Mobile.

The main reason is the elevator shaft, which is the same as the lack of signal in the subway.

The signal is blockedWhen you are in the middle of the mountains, there will be no signal, and the reason is that the mountains block the signal.

The signal is blocked.

It's like if you put an Infinity radio in an iron lunch box, the radio doesn't pick up any signal. It's the same if you put food in an iron lunch box and heat it in the microwave, the food won't get hot.

Eddy currents are formed within the metal, and electromagnetic waves are blocked.

Why is there a signal in many elevators now?

Now mobile phones have become an indispensable part of our lives, there are many friends will have questions, why when you walk into the elevator when you hit **, there will be no signal, let's solve the questions for you, because our mobile phone is like a two-way radio.

I don't know if there was one in high school. hoho。Looks like I didn't study hard

Summary. Hello, there is no signal in the elevator for several reasons:

1) The elevator is generally located in the center of the building, and the signal is seriously blocked;

2) The elevator shaft is long and narrow, with tunnel effect, which leads to the acceleration of wireless signal loss;

3) The elevator is separated by solid reinforced concrete, and it is difficult for the outdoor signal to cover the entire shaft;

4) The elevator car is a metal structure, which has a strong shielding effect on the signal.

5) Some elevators are not completely sealed, but there is also no signal. The reason is that the elevator shaft is often thicker concrete, which has a strong ability to absorb mobile phone signals, which will also lead to weak mobile phone signals, and signal amplifiers need to be installed at this time.

What is the reason for the loss of elevator signal.

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Hello, there is no signal in the elevator because of the following reasons: (1) Envy elevator is generally located in the center of the building, and the signal is seriously blocked; 2) The elevator shaft is long and narrow, with tunnel effect, which leads to the acceleration of wireless signal loss; (3) The elevator is separated by solid reinforced concrete, and it is difficult for the outdoor signal to cover the entire shaft; 4) The elevator car is a metal structure, which has a strong shielding effect on the signal. 5) Some elevators are not completely sealed, but there is also no signal.

The reason is that the electric brother regrets shooting the ladder shaft is often thicker concrete, which has a strong ability to absorb mobile phone signals, which will also lead to weak mobile phone signals, and signal amplifiers need to be installed at this time.

This is mainly because the structure made by the elevator faction god causes the mobile phone to have no dust balance signal blindness. Because the signal in the elevator is not covered, the mobile phone has no signal in the elevator. Because there is no signal amplifier installed in the elevator.

This is because when the elevator is being built, its shaft is often made of relatively thick concrete, and the absorption capacity of the mobile phone signal is very strong, so it will lead to the loss of the mobile phone signal in the elevator; There is no way to solve this situation, because most of the bridge companions, no matter how strong the hand crash machine signal, will be lost in the elevator.

Because elevators are often closed, the hoistway is generally made of very thick concrete, and the signal of the mobile phone is weakened; Generally, some signal amplifiers can be installed in the elevator of the Zen shirt shed.