Interference; Gsm/Wcdma Antenna Requirements - Huawei MU709 Series Hardware Manual

HUAWEI MU709 Series HSPA+ Mini PCIe Module
Hardware Guide
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 MU709 module. Gain of the
primary/diversity antenna ≤ 2.5 dBi
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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 a 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 MU709 module must fulfill the following requirements:
Table 4-7 MU709s-2 module antenna requirements
Antenna Requirements
Frequency range
Bandwidth of primary
antenna
Bandwidth of
secondary antenna
Gain
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, etc.
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 GSM 850
80 MHz in GSM 900
170 MHz in GSM 1800
140 MHz in GSM 1900
80 MHz in WCDMA Band 8
250 MHz in WCDMA Band 1
35 MHz in WCDMA Band 8
60 MHz in WCDMA Band 1
≤ 2.5 dBi
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Copyright © Huawei Technologies Co., Ltd
Issue 04 (2015-06-25)
RF Specifications
33