What about mobile phone signal amplifiers for signal coverage in tunnels?

With the continuous development of transportation, tunnels are necessary in many places. However, there are no signals in many tunnels. Because they are blocked by mountains and walls and are semi-enclosed spaces, the signals emitted by the base station are very weak or even non-existent when they reach the tunnels. Therefore, at this time, tunnel signal coverage is very necessary, because once the tunnel is too long, if an emergency occurs inside, it will be impossible to call for help from the outside world, which is a very dangerous thing. So how to achieve signal coverage in tunnels? The problem of electricity must be solved first. This factor should be taken into consideration when distributing electricity in the tunnel.



The second is to know the structure and length of the tunnel. Whether the tunnel is long, straight, curved, or short, the signal coverage plan will be completely different. There are generally three methods of signal coverage. The first is to directly use a large plate antenna to penetrate from the tunnel entrance to the tunnel. What should be paid attention to here is the issue of isolation. The outdoor antenna cannot be too close to the amplifier. In some areas, the best outdoor signal cannot be found near the tunnel entrance, so such a coverage solution is generally not used. Some people may ask, can I find the best outdoor signal elsewhere and lengthen the patch cord. But don’t forget that there will be line loss and space loss, which will cause a lot of losses and the price/performance ratio is very low.

Therefore, this coverage solution is generally suitable for strong outdoor signals that can be found near the tunnel entrance and short, straight tunnels. Then the second coverage solution is to install ceiling antennas in the tunnel according to regional divisions. The coverage radius of each ceiling antenna is about 10-15 meters. It requires the use of power splitters and couplers to configure. The limitation is that amplifiers generally require Installing it in the middle of the tunnel can ensure optimal coverage, so the location of the outdoor antenna is also limited. Generally, this coverage solution is used for curved and slightly longer tunnels. So if it is a long tunnel with a complex structure, how should we implement a signal coverage solution?

Of course, this requires detailed analysis of the specific situation, but for real tunnel project coverage, it is often not just one repeater that is used to cover it, but several repeaters are often used. There is one at each of the two tunnel entrances. Using the first coverage solution, a large plate antenna is used to shoot into the tunnel entrance. In the tunnel, the second coverage solution is needed, using splitters and couplers to provide planned regional coverage of the ceiling antenna. This is the third coverage solution, which is actually a combination of the first and second coverage solutions. It is also the most commonly used coverage solution for actual tunnel signal coverage.

Another difficulty is the selection of mobile phone signal booster. If the power is not enough, there will be a signal blind zone. If the power is too high, it will be a waste of cost and not cost-effective. The most important thing to remember is the wiring principle. The best output of each terminal antenna is 10dBm.

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