millimeter wave propagation spectrum management implications外语英文电子书

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1、FEDERALCOMMUNICATIONSCOMMISSIONOFFICEOFENGINEERINGANDTECHNOLOGYBulletinNumber70July,1997MillimeterWavePropagation:SpectrumManagementImplicationsFederalCommunicationsCommissionOfficeofEngineeringandTechnologyNewTechnologyDevelopmentDivisionMailStopCode1300-EWashington,DC20554ABSTRACTThespectrumbet

2、ween30GHzand300GHzisreferredtoasthemillimeterwavebandbecausethewavelengthsforthesefrequenciesareaboutonetotenmillimeters.Millimeterwavepropagationhasitsownpeculiarities.Thispaperreviewsthecharacteristicsofmillimeterwavepropagation,includingfreespacepropagationandtheeffectsofvariousphysicalfactors

3、onpropagation.Itwascreatedtoprovideaneasytounderstandreferenceexplainingthecharacteristicsofradiosignalpropagationatmillimeterwavefrequenciesandtheirimplicationsforspectrummanagement.Theinformationpresentedshouldbeusefultofrequencymanagers,systemdesigners,policymakers,andusersofmillimeterwavecomm

4、unications.PreparedbyNewTechnologyDevelopmentDivision,OETiINTRODUCTIONThemillimeterwavespectrumat30-300GHzisofincreasinginteresttoserviceprovidersandsystemsdesignersbecauseofthewidebandwidthsavailableforcarryingcommunicationsatthisfrequencyrange.Suchwidebandwidthsarevaluableinsupportingapplicatio

5、nssuchashighspeeddatatransmissionandvideodistribution.Planningformillimeterwavespectrumusemusttakeintoaccountthepropagationcharacteristicsofradiosignalsatthisfrequencyrange.Whilesignalsatlowerfrequencybandscanpropagateformanymilesandpenetratemoreeasilythroughbuildings,millimeterwavesignalscantrav

6、elonlyafewmilesorlessanddonotpenetratesolidmaterialsverywell.However,thesecharacteristicsofmillimeterwavepropagationarenotnecessarilydisadvantageous.Millimeterwavescanpermitmoredenselypackedcommunicationslinks,thusprovidingveryefficientspectrumutilization,andtheycanincreasesecurityofcommunication

7、transmissions.Thispaperreviewscharacteristicsofmillimeterwavepropagation,includingfreespacepropagationandtheeffectsofvariousphysicalfactorsonpropagation.FREESPACE,BENIGNPROPAGATIONCONDITIONSThefrequencyanddistancedepen