Location Of Bts Antennae; Exclusion Zones - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
. 1
=
r
Whereas:
r = distance from the antenna [m]
G
= Antenna gain relative to half wave dipole
d
Pt
= Power at the antenna terminals [W]
S = power density [W/m
Note: 1mW/cm
D.5 Location of BTS Antennae
BTS antennas, the source of the radiation, are usually mounted on freestanding towers,
with a height up to 30 m or on a tower on the top of buildings or, in some cases, to the
side of the building.
Generally the height of the antenna position does not fall below 10 m.
The power usually is focused into a horizontal main beam and slightly downward tilted.
The remaining power goes into the weaker beams on both side of the main beam. The
main beam however does not reach ground level until the distance from the antenna
position is around 50~200 m.
The highest level of emission would be expected in close vicinity of the antenna and in
line of sight to the antenna.
D.5.1 Exclusion Zones
Antenna location should be designed so that the public cannot access areas where the
RF radiation exceeds the levels as described above. .
If there are areas accessible to workers that exceed the RF radiation exceeds the
levels as described above make sure that workers know where these areas are, and
that they can (and do) power-down (or shut down) the transmitters when entering these
areas. Such areas may not exist; but if they do, they will be confined to areas within 10
m of the antennas.
Each exclusion zone should be defined by a physical barrier and by a easy
recognizable sign warning the public or workers that inside the exclusion zone the RF
radiation might exceed national limits.
64 * G * Pt
d
π 4
S
] see also MPE Limits
2
2 = 10W/m 2
Appendix D Electromagnetic Radiation
D-4
System Principle