HUAWEI EM820W HSPA+ PC Embedded Module

 

Hardware Guide

RF Specifications

zAdding a bandpass filter to the Wi-Fi channel to filter the WCDMA, GSM850, GSM900, DCS, and PCS signals

zEnsuring sufficient isolation between the master antenna of the data card module and the Wi-Fi antenna

Table 4-4 lists the requirements for the isolation between the master antenna and the Wi-Fi antenna in different frequency bands according to the interference suppression supported by the filter in different frequency bands.

Table 4-4Isolation between the master antenna and the Wi-Fi antenna

Frequency

Transmit

Conducted

Ant

Wi-Fi Front End

Band

Frequency

Transmit

Isolator

Filter Attenuation

 

 

Power (dBm)

(dB)

(dB)

UMTS2100

1920–1980 MHz

24

11

34

 

 

 

 

 

UMTS1900

1850–1910 MHz

24

11

34

 

 

 

 

 

UMTS850

824–849 MHz

24

10

36

 

 

 

 

 

UMTS900

880–915 MHz

24

10

36

 

 

 

 

 

GSM850

824–849 MHz

33

18

36

 

 

 

 

 

GSM900

880–915 MHz

33

18

36

 

 

 

 

 

DCS

1710–1785 MHz

30

17

34

 

 

 

 

 

PCS

1850–1910 MHz

30

17

34

 

 

 

 

 

S11 or VSWR

S11 (return loss) indicates the degree to which the input impedance of an antenna matches the reference impedance (50 ohm). S11 shows the resonance feature and impedance bandwidth of an antenna. Voltage standing wave ratio (VSWR) is another expression of S11. S11 relates to the antenna efficiency. S11 can be measured with a vector analyzer.

The following S11 values are recommended for the antennas on laptops:

zS11 of the master antenna < -6 dB

zS11 of the slave antenna < -6 dB

zS11 of the GSP antenna < -10 dB

zS11 of the Wi-Fi antenna < -10 dB

Polarization

The polarization of an antenna is the orientation of the electric field vector that rotates with time in the direction of maximum radiation.

The linear polarization is recommended for the antennas on laptops.

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

21

Copyright © Huawei Technologies Co., Ltd.

 

 

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Huawei EM820W manual UMTS850, UMTS900, Dcs, Pcs

EM820W specifications

The Huawei EM820W is a cutting-edge mobile broadband device that exemplifies Huawei's commitment to innovation and excellence in the telecommunications sector. Designed for seamless connectivity, the EM820W caters primarily to users who demand high-speed data access while on the move.

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The Huawei EM820W comes with a user-friendly interface, enabling users to easily manage their connections and monitor data usage. This feature is valuable for those who need to track their internet consumption to avoid exceeding data limits imposed by service providers.

With its blend of speed, portability, and user-oriented features, the Huawei EM820W stands out as a reliable solution for those seeking robust mobile broadband capabilities. Whether for personal use or professional needs, this device ensures that users remain connected in an increasingly digital world.