Huawei ME909 manual Interference, 3 GSM/WCDMA/GPS Antenna Requirements

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HUAWEI ME909 Series Mini PCIe Module

 

Hardware Guide

RF Specifications

Antenna direction

The antenna correlation coefficient differs from the antenna isolation. Sufficient antenna isolation does not represent a satisfactory correlation coefficient. For this reason, the two indicators need to be evaluated separately.

For the antennas on laptops, the recommended envelope correlation coefficient between the primary antenna and the diversity antenna is smaller than 0.5.

Gain and Directivity

The radiation pattern of an antenna represents the field strength of the radiated electromagnetic waves in all directions, but not the power density that the antenna radiates in the specific direction. The directivity of an antenna, however, measures the power density that the antenna radiates.

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 ME909 module. Gain of the primary/diversity antenna ≤ 2.5 dBi

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.

4.5.2Interference

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.

4.5.3GSM/WCDMA/GPS Antenna Requirements

The antenna for ME909 module must fulfill the following requirements:

 

Huawei Proprietary and Confidential

31

Issue 0.1 (2013-06-09)

Copyright © Huawei Technologies Co., Ltd.

 

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Contents Hardware Guide Issue DateNo Warranty Revision History About This DocumentDocument Date Chapter Descriptions Version Contents Certifications FCC Statement 1ME909 series product name IntroductionProduct name Description State Function Overview Feature DescriptionOverall Description About This ChapterLEDWWAN# Active-low LED signal indicating the state Circuit Block DiagramMini PCIe Interface Description of the Application InterfacesGND WAKE#VCC3V3 COEX1Uimdata UimresetWDISABLE# UimpwrUSBD+ Usbdp SmbclkSmbdata Usbd UsbdmPin No Pin Name Minimum Typical Maximum Power Sources and GroundsParameter Remarks Time Nominal value Unit Power Supply Time SequencePower Valid to USB + high Cutting off 3.3 V will power off the moduleResinn Signal WAKE# Signal6Reset pulse timing LEDWWAN# Signal WDISABLE# SignalUSB Interface Overview Pin No Pin Name Description DC Characteristics Min Typ MaxPin Pin Name Description DC Characteristics Min Typ Max Usim Card InterfaceExternal 2.85 Usim card Circuit Recommended for the Usim Card InterfacePCM data input Pin Pin Name Description DC Characteristics Min TypAudio Interface PCM clockRF Antenna Connector Reserved Reserved, please keep open Reserved PinsNC Pins Pin No Pin Name DescriptionNC pins Operating Frequencies RF SpecificationsOperating Band Test Standards Conducted Rx Sensitivity and Tx PowerConducted RF Measurement Test EnvironmentTBD Band TypicalType Value 16QAM Conducted Transmit PowerModulation RB Allocation MPRdB QpskAntenna Design Requirements Antenna Design IndicatorsPolarization 3 GSM/WCDMA/GPS Antenna Requirements InterferenceAntenna for that/those bands Radio Test EnvironmentFrequency range Operator, the customer must use the most suitablePassive Tests Absolute Ratings Electrical and Reliability FeaturesSymbol Specification Min Max Unit External power voltage Digital input voltageSpecification Min Max Unit Operating and Storage Temperatures and HumidityElectrical Features of Usim Electrical Features of Application InterfacesParameter Min Typ Max Ripple Unit Power Supply FeaturesInput Power Supply Power Module Peak GSM Normal Normal LTE SlotDescription Bands Test Value Units Power ConsumptionWcdma Description Band Test Value Units Power dBmHsdpa IMT2100 23dBm Tx PowerLTE GPRS900 TBD ConfigurationDescription Test Value Units GPRS850 TBDEDGE850 TBD Description Max Test Value Units ConfigurationEDGE900 TBD Test Condition Standard Reliability Features− UIM − USB EMC and ESD FeaturesHuawei Proprietary and Confidential Issue 0.1 Dimensions and Interfaces Mechanical Specifications1Dimensions of the ME909 module Dimensions of the Mini PCI Express ConnectorInstalling the Mini PCIe Adapter on the Main Board Specification Selection for FastenersHuawei Proprietary and Confidential Issue 0.1 Removing the Mini PCIe Adapter from the Main Board Page GCF Weee CertificationsCertifications Certification Model name ME909u-521Area with Inflammables and Explosives Safety InformationInterference Medical DeviceEnvironment Protection Safety of ChildrenTraffic Security Airline SecurityRegulatory Information Care and MaintenanceLaws and Regulations Observance Emergency CallFCC Statement Appendix a Circuit of Typical Interface Acronym or Abbreviation Expansion Appendix B Acronyms and AbbreviationsLCP HSPA+Hsupa ISO
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