Interference; Antenna Requirements - Huawei MU709 Series Hardware Manual

HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide

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 MU709 module must fulfill the following requirements:
Table 4-7 MU709s-2 module antenna requirements
GSM/WCDMA Antenna Requirements
Frequency range
Bandwidth of primary
antenna
Bandwidth of
secondary antenna
Gain
Impedance
VSWR absolute max
VSWR recommended
Issue 09 (2017-12-15)
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
50 Ω
≤ 3:1
≤ 2:1
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RF Specifications
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