Huawei MU609 Hardware Manual page 48

HUAWEI MU609 HSPA LGA Module
Hardware Guide
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The primary antenna must be placed as near as possible to the MU609 to minimize
the cable length.
primary antenna. The diversity antenna can be placed farther away from the MU609.
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.
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.
Primary/diversity/GPS antenna: omnidirectional
In addition, the diversity antenna's pattern should be complementary with the primary
antenna's pattern.
Envelope Correlation Coefficient
The envelope correlation coefficient indicates the correlation between different
antennas in a multi-antenna system (primary antenna, diversity antenna, and MIMO
antenna). The correlation coefficient shows the similarity of radiation patterns, that is,
amplitude and phase, of the antennas. The ideal correlation coefficient of a diversity
antenna system or a MIMO antenna system is 0. A small value of the envelope
correlation coefficient between the primary antenna and the diversity antenna
indicates a high diversity gain. The envelope correlation coefficient depends on the
following factors:
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Issue 04 (2016-12-12)
Antenna type
Antenna direction
The diversity antenna
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 (diversity) antenna and the Wi-Fi antenna: ≤
–15 dB
Distance between antennas
Antenna type
Antenna direction
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needs to be installed perpendicularly to the
RF Specifications
48