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HUAWEI MU509-65 HSDPA LGA Module
Hardware Guide
In addition, the correlation coefficient of the primary antenna should be low.
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: Gain of the primary antenna ≤ 2.5 dBi.
4.5.2 Interference
Besides the antenna performance, the interference on the user board also affects the
radio performance (especially the TIS) of the module. To guarantee high performance
of the module, the interference sources on the user board must be properly controlled.
On the user board, there are various interference sources, such as the LCD, CPU,
audio circuits, and power supply. All the interference sources emit interference signals
that affect the normal operation of the module. For example, the module sensitivity
can be decreased due to interference signals. Therefore, during the design, you need
to consider how to reduce the effects of interference sources on the module. You can
take the following measures: Use an LCD with optimized performance; shield the LCD
interference signals; shield the signal cable of the board; or design filter circuits.
Huawei is able to make technical suggestions on radio performance improvement of
the module.
4.5.3 Antenna Requirements
The antenna for MU509-65 must fulfill the following requirements:
Antenna Requirements
Frequency range
Bandwidth of primary
antenna
Gain
Impedance
VSWR absolute max
VSWR recommended
Issue 01 (2016-04-08)
Depending on frequency band(s) provided by the network
operator, the customer must use the most suitable
antenna for that/those band(s)
70 MHz in WCDMA Band 5
140 MHz in WCDMA Band 2
≤ 2.5 dBi
50 Ω
≤ 3:1
≤ 2:1
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
RF Specifications
47
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