Why lift cover individual signals, how to achieve it

After the elevator car door and the door is closed, will form a Faraday cage Faraday cage electrostatic shielding effect of electromagnetic waves also have a better shielding effect, and because of the position of the elevator often located in the center of the building, so by the wall loss of body is relatively large, plus the tunnel effect because the elevator shaft itself, and thus need to do a special coverage. Elevator on the coverage of the most widely used method, there are three, but in fact should be far more than these three, in which three of the most common methods are introduced.

1 The first one is the elevator shaft cove
This method is installed inside the elevator shaft directional antenna (usually at the top), or omnidirectional antenna (usually in the middle of the elevator shaft), transmit signals, but also need the receiving antenna and the relay station on the roof. But this method problems, the first is the construction of trouble, and the second is an antenna or other equipment may fall, very hidden, the third point is the signal strength and location of the elevator, the elevator when the distance is far, when receiving the signal may will not ideal, so it was proposed this method, a plurality of antennas arranged to solve this problem.

2 The second is the elevator hall covering
It is omnidirectional antenna installed on each floor of the elevator hall, and then rely on electromagnetic waves leak into the inside of the car to communicate. This method compared to the elevator shaft cover even worse, because relying on electromagnetic waves leak into the power is still limited, and the signal is not stable, it is not much use. This method compared to the elevator shaft cover even worse, because relying on electromagnetic waves leak into the power remains limited, and the signal is not stable, it is not much use.
3 The third is leaked cables
The use of coaxial cable can have both leakage and radiation characteristics of the transmission signal based on the opening. This method of construction is easy, the structure is relatively simple, the basic need to worry about the impact on the elevator position signal. , But the disadvantage is the higher price of leaky coaxial cable (one meter closer to 30RMB), when the top cover of the large cost.

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