短波发射接收天线特性分析

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

2、fPart2toAnnex 1totheattentionoftheInternationalElectrotechnicalCommission(IEC).(1990-1995)TheITURadiocommunicationAssembly,consideringa)thatResolutionITU-R 31decidedtoissueaseparatelypublishedRecommendationcontainingarevisedandcomplementedsetofHFbroadcastingantennadiagramstogethe

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

4、atthecharacteristicsoftheHFantennasascontainedinAnnexes1and2tothisRecommendationhaveawideapplication,furtherconsideringe)thattheradiationpatternofthereceivingantennashouldalsobetakenintoaccountwhenplanningsoundbroadcastingservicesinband7(HF);f)thatuptothepresenttimenoreceivingant

5、ennaradiationpatternhasbeendefinedfortheabovepurpose;g)thatthereceivingenvironmentsignificantlyaffectstheradiationpatternofreceivingantennas;h)thatashortverticalwhipantennaismostoftenusedforreceptionofsoundbroadcastinginband7(HF),recommends1thattheformulaeasillustratedbysampledia

6、gramsandcontainedinAppendix1toAnnex 1ofthisRecommendationtogetherwiththecorrespondingcomputerprogramsshouldbeusedtoevaluatetheperformanceofHFtransmittingantennas;particularlyforplanningpurposes;2thattheformulaasillustratedbyasamplediagramandcontainedinPart1toAnnex2tothisRecommend

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

8、lopedfromthetheorytocalculatetheradiatio