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Hardware Guide
RF Specifications
Issue 01 (2011-04-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
46
expression of S11. S11 relates to the antenna efficiency. S11 can be measured with a
vector analyzer.
The following S11 values are recommended for the antenna of MC509: S11 of the
master antenna < –6dB
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 MC509.
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 can be used for wireless terminals.
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 MC509: Master
antenna: omnidirectional
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 MC509: Gain of the master
antenna ≤ 2.5dBi
The antenna consists of the antenna body and the relevant RF transmission cable. Take
the RF transmission cable into account when measuring any of the preceding antenna
indicators.
Huawei cooperates with various famous antenna suppliers who are able to make
suggestions on antenna design, for example, Amphenol, Skycross, Pulse, etc.