Huawei ME906s LTE M.2 Hardware Manual page 50

HUAWEI ME906s LTE M.2 Module
Hardware Guide



The primary antenna must be placed as near as possible to the ME906s to minimize
the cable length. The secondary antenna needs to be installed perpendicularly to the
primary antenna. The secondary antenna can be placed farther away from the
ME906s. Antenna isolation can be measured with a two-port vector network analyzer.
The following S21 values are recommended for the antenna on laptops:


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 ME906s.
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 ME906s.
Primary antenna: omnidirectional.
Secondary antenna: omnidirectional (Upper Hem Partial Radiated Power ≥ 40% @
1574.42 MHz–1605.89 MHz)
In addition, the secondary antenna's pattern should be complementary with the
primary antenna's pattern.
Gain and Directivity
The radiation pattern of an antenna represents the field strength of the radiated
electromagnetic waves in all directions, but not the power density that the antenna
radiates in the specific direction. The directivity of an antenna, however, measures
the power density that the antenna radiates.
Gain, as another important parameter of antennas, correlates closely to the
directivity. The gain of an antenna takes both the directivity and the efficiency of the
antenna into account. The appropriate antenna gain prolongs the service life of
relevant batteries.
The following antenna gain is recommended for ME906s.
Issue 05 (2019-03-25)
Distance between antennas
Antenna type
Antenna direction
Isolation between the primary and secondary antennas ≤ –12 dB(≤ –15 dB @
1574.42 MHz–1605.89 MHz)
Isolation between the primary (secondary) antenna and the Wi-Fi antenna ≤ –15
dB
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
RF Specifications
50