Huawei MU609 Mini Hardware Manual page 27

HUAWEI MU609 Mini PCIe Module
Hardware Guide
Isolation
For a wireless device with multiple antennas, the power of different antennas is
coupled with each other. Antenna isolation is used to measure the power coupling.
The power radiated by an antenna might be received by an adjacent antenna, which
decreases the antenna radiation efficiency and affects the running of other devices. To
avoid this problem, evaluate the antenna isolation as sufficiently as possible at the
early stage of antenna design.
Antenna isolation depends on the following factors:
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The primary antenna must be placed as near as possible to the MU609 module to
minimize the cable length. The diversity antenna needs to be installed
perpendicularly to the primary antenna. The diversity antenna can be placed farther
away from the MU609 module. Antenna isolation can be measured with a two-port
vector network analyzer.
The following antenna isolation is recommended for the antennas on laptops:
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Polarization
The polarization of an antenna is the orientation of the electric field vector that rotates
with time in the direction of maximum radiation.
The linear polarization is recommended for the antenna of MU609 module.
Radiation Pattern
The radiation pattern of an antenna reflects the radiation features of the antenna in
the remote field region. The radiation pattern of an antenna commonly describes the
power or field strength of the radiated electromagnetic waves in various directions
from the antenna. The power or field strength varies with the angular coordinates (θ
and φ), but is independent of the radial coordinates.
The radiation pattern of half wave dipole antennas is omnidirectional in the horizontal
plane, and the incident waves of base stations are often in the horizontal plane. For
this reason, the receiving performance is optimal.
The following radiation patterns are recommended for the antenna of MU609 module.
Primary/diversity/GPS antenna: omnidirectional
In addition, the diversity antenna's pattern should be complementary with the
primary's.
Issue V0.1 (2013-05-16)
Distance between antennas
Antenna type
Antenna direction
Isolation between the primary and diversity antennas: ≤ –12 dB
Isolation between the primary(diversity) antenna and the GPS antenna: ≤
–15 dB
Isolation between the primary antenna and the Wi-Fi antenna: ≤ –15 dB
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RF Specifications
27