短波发射接收天线特性分析.doc）

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1、Rec.ITU-RBS.705-1147RECOMMENDATIONITU-RBS.705-1*RadiocommunicationStudyGroup6madeeditorialamendmentstothisRecommendationin2002inaccordancewithResolutionITU-R44.HFtransmittingandreceivingantennascharacteristicsanddiagrams**TheDirector,RadiocommunicationBureau,isrequestedtobring§2ofPart2toAnn

2、ex 1totheattentionoftheInternationalElectrotechnicalCommission(IEC).(1990-1995)TheITURadiocommunicationAssembly,consideringa)thatResolutionITU-R 31decidedtoissueaseparatelypublishedRecommendationcontainingarevisedandcomplementedsetofHFbroadcastingantennadiagramstogetherwithotherrelevantinfo

3、rmation;b)thatthediagramspublishedinthisRecommendationshouldbeeasytobeunderstoodandusedbytheplanninganddesigningengineers,whileretainingallthenecessaryusefulinformation;c)theexperiencegainedwiththepreviouseditionsoftheex-CCIRpublication“Antennadiagrams”;d)thatthecharacteristicsoftheHFantenn

4、asascontainedinAnnexes1and2tothisRecommendationhaveawideapplication,furtherconsideringe)thattheradiationpatternofthereceivingantennashouldalsobetakenintoaccountwhenplanningsoundbroadcastingservicesinband7(HF);f)thatuptothepresenttimenoreceivingantennaradiationpatternhasbeendefinedfortheabov

5、epurpose;g)thatthereceivingenvironmentsignificantlyaffectstheradiationpatternofreceivingantennas;h)thatashortverticalwhipantennaismostoftenusedforreceptionofsoundbroadcastinginband7(HF),recommends1thattheformulaeasillustratedbysamplediagramsandcontainedinAppendix1toAnnex 1ofthisRecommendati

6、ontogetherwiththecorrespondingcomputerprogramsshouldbeusedtoevaluatetheperformanceofHFtransmittingantennas;particularlyforplanningpurposes;2thattheformulaasillustratedbyasamplediagramandcontainedinPart1toAnnex2tothisRecommendationshouldbeusedtoevaluatetheperformanceofthereceivingantennaforp

7、lanningsoundbroadcastingservicesinband 7 (HF).Rec.ITU-RBS.705-1147NOTE 1 – Part 1toAnnex 1givescomprehensiveanddetailedinformationonthetheoreticalcharacteristicsofHFtransmittingantennas.Computerprogramshavebeendevelopedfromthetheorytocalculatetheradiatio