Esd Protection For The Antenna Interface; Figure 4-2 Recommended Antenna Positions - Huawei EM820W Hardware Manual

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HUAWEI EM820W HSPA+ PC Embedded Module

Hardware Guide

4.6 ESD Protection for the Antenna Interface

In practical application, pay attention to the ESD protection for the antenna interface

of the EM820W module. Incorrect operation may result in permanent damage to the

RF components.

Figure 4-3 shows the ESD protection circuit recommended for the antenna interface.

Issue 01 (2010-12-09)

It is recommended that the antenna pattern be designed based on the horizontal

polarized omnidirectional pattern that facilitates the reception of strong signals

especially in outdoor environments.

Besides the module antennas, a laptop has other internal antennas, such as the

WLAN antenna. Therefore, when designing the module antennas, the

requirement on the isolation between module antennas and other laptop

antennas should be considered. Ensure that proper distance is maintained

between antennas if possible. To reduce the interference between antennas, it is

recommended that an antenna is not designed close to another one.

Carefully design the metallic components (such as the external frame of the

metallic shell) in and near the antenna area by considering the effects on the

antenna performance (such as whether the frequency offset of the antenna

occurs and whether the antenna pattern is deformed).

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RF Specifications

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