Huawei ME909 manual Polarization

Page 30

HUAWEI ME909 Series Mini PCIe Module

 

Hardware Guide

RF Specifications

Distance between antennas

Antenna type

Antenna direction

The primary antenna must be placed as near as possible to the ME909 module to minimize the cable length. The diversity antenna needs to be installed perpendicularly to the primary antenna. The diversity antenna can be placed farther away from the ME909 module. Antenna isolation can be measured with a two-port vector network analyzer.

The following antenna isolation is recommended for the antennas on laptops:

Isolation between the primary and diversity antennas: ≤ –12 dB

Isolation between the primary(diversity) antenna and the GPS antenna: ≤

–15 dB

Isolation between the primary antenna and the Wi-Fi antenna: ≤ –15 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 antenna of ME909 module.

Radiation Pattern

The radiation pattern of an antenna reflects the radiation features of the antenna in the remote field region. The radiation pattern of an antenna commonly describes the power or field strength of the radiated electromagnetic waves in various directions from‎the‎antenna.‎The‎power‎or‎field‎strength‎varies‎with‎the‎angular‎coordinates‎(θ‎ and‎φ),‎but‎is‎independent‎of‎the‎radial coordinates.

The radiation pattern of half wave dipole antennas is omnidirectional in the horizontal plane, and the incident waves of base stations are often in the horizontal plane. For this reason, the receiving performance is optimal.

The following radiation patterns are recommended for the antenna of ME909 module.

Primary/Diversity/GPS antenna: omnidirectional

In addition, the diversity‎antenna’s pattern should be complementary with the primary’s.

Envelope Correlation Coefficient

The envelope correlation coefficient indicates the correlation between different antennas in a multi-antenna system (primary antenna, diversity antenna, and MIMO antenna). The correlation coefficient shows the similarity of radiation patterns, that is, amplitude and phase, of the antennas. The ideal correlation coefficient of a diversity antenna system or a MIMO antenna system is 0. A small value of the envelope correlation coefficient between the primary antenna and the diversity antenna indicates a high diversity gain. The envelope correlation coefficient depends on the following factors:

Distance between antennas

Antenna type

 

Huawei Proprietary and Confidential

30

Issue 0.1 (2013-06-09)

Copyright © Huawei Technologies Co., Ltd.

 

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Page 29 Page 31
Contents Issue Date Hardware GuideNo Warranty About This Document Revision HistoryDocument Date Chapter Descriptions Version Contents Certifications FCC Statement Introduction 1ME909 series product nameProduct name Description State About This Chapter Feature DescriptionOverall Description Function OverviewCircuit Block Diagram LEDWWAN# Active-low LED signal indicating the stateDescription of the Application Interfaces Mini PCIe InterfaceCOEX1 WAKE#VCC3V3 GNDUimpwr UimresetWDISABLE# UimdataUsbd Usbdm SmbclkSmbdata USBD+ UsbdpPower Sources and Grounds Pin No Pin Name Minimum Typical MaximumCutting off 3.3 V will power off the module Power Supply Time SequencePower Valid to USB + high Parameter Remarks Time Nominal value UnitWAKE# Signal Resinn Signal6Reset pulse timing WDISABLE# Signal LEDWWAN# SignalUSB Interface Usim Card Interface Pin No Pin Name Description DC Characteristics Min Typ MaxPin Pin Name Description DC Characteristics Min Typ Max OverviewCircuit Recommended for the Usim Card Interface External 2.85 Usim cardPCM clock Pin Pin Name Description DC Characteristics Min TypAudio Interface PCM data inputRF Antenna Connector Pin No Pin Name Description Reserved PinsNC Pins Reserved Reserved, please keep openNC pins RF Specifications Operating FrequenciesOperating Band Test Environment Conducted Rx Sensitivity and Tx PowerConducted RF Measurement Test StandardsBand Typical TBDType Value Qpsk Conducted Transmit PowerModulation RB Allocation MPRdB 16QAMAntenna Design Indicators Antenna Design RequirementsPolarization Interference 3 GSM/WCDMA/GPS Antenna RequirementsOperator, the customer must use the most suitable Radio Test EnvironmentFrequency range Antenna for that/those bandsPassive Tests External power voltage Digital input voltage Electrical and Reliability FeaturesSymbol Specification Min Max Unit Absolute RatingsElectrical Features of Application Interfaces Operating and Storage Temperatures and HumidityElectrical Features of Usim Specification Min Max UnitPower Module Peak GSM Normal Normal LTE Slot Power Supply FeaturesInput Power Supply Parameter Min Typ Max Ripple UnitPower Consumption Description Bands Test Value UnitsDescription Band Test Value Units Power dBm WcdmaHsdpa 23dBm Tx Power IMT2100LTE GPRS850 TBD ConfigurationDescription Test Value Units GPRS900 TBDDescription Max Test Value Units Configuration EDGE850 TBDEDGE900 TBD Reliability Features Test Condition StandardEMC and ESD Features − UIM − USBHuawei Proprietary and Confidential Issue 0.1 Mechanical Specifications Dimensions and InterfacesDimensions of the Mini PCI Express Connector 1Dimensions of the ME909 moduleSpecification Selection for Fasteners Installing the Mini PCIe Adapter on the Main BoardHuawei Proprietary and Confidential Issue 0.1 Removing the Mini PCIe Adapter from the Main Board Page Certification Model name ME909u-521 CertificationsCertifications GCF WeeeMedical Device Safety InformationInterference Area with Inflammables and ExplosivesAirline Security Safety of ChildrenTraffic Security Environment ProtectionEmergency Call Care and MaintenanceLaws and Regulations Observance Regulatory InformationFCC Statement Appendix a Circuit of Typical Interface Appendix B Acronyms and Abbreviations Acronym or Abbreviation ExpansionISO HSPA+Hsupa LCP
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