As the rapid development of mobile communications, there are many parts of the country at present the coexistence of multiple networks, namely A, B, G three networks co-exist, some of the region G network also includes GSM9000 and GSM1800. To take full advantage of resources, sharing resources, we generally use the antenna in the form of tower. This involves the proper installation of the antenna problem, namely how to install the antenna in order to minimize the interaction between. In the project we generally use the indicators to measure the degree of isolation, often require isolation should be at least greater than 30dB, in order to meet the requirements, often using the antenna in the vertical direction separated or separated in the horizontal direction method proved the antenna the same pitch, mounted vertically than horizontally to greater isolation.
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In general, antenna installation should pay attention to the following questions:
(1) directional antenna tower side of the installation: antenna tower to reduce the effects of antenna directivity diagram in the installation should pay attention: the center of a directional antenna to the tower of the distance of λ / 4 or 3λ / 4, the availability of tower The maximum directivity.
(2) omni-directional antenna tower side of the installation: antenna tower to reduce the effects of antenna directivity diagram, in principle, can not be the antenna tower antenna reflector. Therefore, in the installation, the antenna should always be installed on the edges and corners on the tower and the antenna and the nearest part of any distance greater than λ.
(3) of multi-antenna tower: To minimize the different network transceiver antennas and mutual coupling between the effects of trying to increase the isolation between the antenna, the best way is to increase the distance between each other. A total of antenna towers, priority should be installed vertically.
(4) the traditional unipolar antenna (vertical polarization), the antenna (RX-TX, TX-TX) isolation (≥ 30dB) and space diversity technology demands to a certain antenna horizontal and vertical spacing distance, usually vertical distance of about 50cm, horizontal distance of about 4.5m, then the need to increase investment in infrastructure to expand the installation of the antenna platform, and for dual-polarized antenna (± 45 ° polarization), as ± 45 ° of polarization orthogonality guarantees +45 ° and -45 ° between the two antennas to meet the intermodulation isolation between the antenna isolation requirement (≥ 30dB), so the space interval between dual-polarized antenna only 20-30cm, cellular base stations do not have to build towers, only need to frame a diameter of 20cm of iron posts, the dual-polarized antenna cover according to the corresponding direction can be fixed on the pillar.
Small knot
--- Away from the tower platform:> 1M
--- Antenna spacing:
--- The same cell diversity reception antenna:> 3M
--- Standard omnidirectional antenna spacing:> 4M
--- Level of directional antenna spacing:> 2.5M
--- Vertical antenna spacing on different platforms:> 1M
--- In addition to manual specifically receive antenna placement can not be inverted.
--- In the range of lightning protection.
--- Antenna location: For directional antennas, the first sector of north 60 degrees east, directly south of the second sector, third sector north 60 degrees west.
--- Antenna tilt: to ensure that the actual angle of the antenna design requirements in line with SE, the error is less than 2 degrees.
--- Antenna verticality: In addition to a base station antenna tilt, the vertical antenna to ensure that not more than 2 degrees.
