Interference; Cdma Antenna Requirements - Huawei MC509 Series Hardware Manual

HUAWEI MC509 Series CDMA LGA Module
Hardware Guide
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 ≤ 2.5 dBi

4.6.2 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.

4.6.3 CDMA Antenna Requirements

The antenna for MC509 must fulfill the following requirements:
CDMA Antenna Requirements
Frequency range
Bandwidth
Gain
Impedance
VSWR absolute max
VSWR recommended
Issue 02 (2013-05-06)
 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.
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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 CDMA800 (25 MHz for diversity antenna)
140 MHz in CDMA1900 (60 MHz for diversity antenna)
Gain ≤ 2.5 dBi
50-ohm
≤ 3:1 (≤ 2:1 for GPS antenna)
≤ 2:1 (≤ 1.5:1 for GPS antenna)
RF Specifications
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