广播电视发射天线场形的可视化计算

©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:[e-mail]797100520388(2008)04207972063(,4530003),,,(),,;;;TN948152AVisualcalculationofbroadcastingtransmissionantennafieldLIUDong2tao(HenanPeople’sRadioStation,ZhengzhouHenan450003,China)AbstractBroadcastingtransmissionantennaisakeyelementofbroadcastingradiotransmitsystem.Thevisualcalculationofthefieldispresentedfortheantennaformchoice,beamcontrol,andzeropointscancellation.Amathematicmodelisbuilttoanalyzethehorizontaldirectivediagramandtheshapedbeams,somesolu2tionsarealsointroducedfortheantennaverticaldirectivediagram,radiationeffi2ciency,downwardinclinedmainlobeandzeropointscancellation.Keywordsantennafield;visualcalculation;patternfunction;directionaldiagram1,,,,,,,2(1)n,,,PE(,),(^a^a)E(,)E(,),E(,)=E(,)+E(,)(1)1,,:1),P1P2P3P42)12343:2007206229©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)12n4)Xf(,)f(,),,,,E(,)=A()[P1f(,)ej(kD2sincos-kd1sinsin+1)+P2f(,-2)ej(kD2sinsin+kd2sincos+2)+P3f(,-)ej(-kD2sincos+kd3sinsin+3)+P4f(,-32)e-j(kD2sinsin+kd4sincos+4](2)E(,)=A()[P1f(,)ej(kD2sincos-kd1sinsin+1)+P2f(,-2)ej(-kD2sinsin+kd2sincos+2)+P3f(,-)ej(-kD2sincos+kd3sinsin+3)+P4f(,-32)ej(kD2sinsin+kd4sincos+4](3),k=2/,A()Z,A()=ej1+ej(-kscos+2)+ej(-2kscos+3)++ej[-(n-1)kscos+n](4)S,(2)(3)(1)1E(,)=E(,)^a+E(,)^a(5)^a^a(2)(3),E(,)E(,),,E(,)=|E(,)|ej(,)(6)E(,)=|E(,)|ej(,)(7),(),1E(,)n=E(,)E(,)max(8)E(,)n=E(,)E(,)max(9),(8)(9),,FMUHF(2)(3)233,,89723©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1),(),=/2(2)(3),(8)(9)=/2(2)(3)E()=P1f()ej(kD2cos-kd1sin+1)+P2f-2ej(kD2sin+kd2cos+2)+P3f(-)ej(-kD2cos+kd3sin+3)+P4f-32e-j(kD2sin+kd4cos-4)(10)f()X,,(10)(P1P2P3P4)(1234)(d1d2d3d4),,L=0.5H=0.25W=0.6,D=0.814P1=P2=P3=P4()d1=d2=d3=d4=0.19()1=02=-/23=-4=-3/2()25P1=P2=P3=P4()d1=d2=d3=d4=0()1=02=-/23=-4=-3/2()36P1=0.4P2=0.4P3=0.1P4=0.1()d1=d2=d3=d4=0()1=2=3=4=0()12,90,,3,,4564,,(),,(1),(8)(9),9974:©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=(1.5-2)H,784.2?,,,,,8,(r1r2r3),,,,,4.3,,mej,m10,,;m=10,,,,4.3.1()9,,,4.358.7180m,,2.37km(r1)1.18km(r2),100.8,15%,6%,,91000823©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(),,,11,,,,,,,,,111:(150m),10,,12,1.36,18.2%,,1.1dB2:(150m),15%,9.5,13,1,14.3%,,1.05dB12,,,,(1),,,,,,,135,,,,86.2%,,,,,,,,,,,[1]WarrenL.Stutzman,GaryA.Thiele(),,.[M].:,2006,10.[2],.[J].,2003,25(4):4172421.1084:©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[3]AberleJT,OhSung2Hoon,AucklandDT,etal..ReconfigurableAntennasforWirelessDevices[J].IEEEAntennasandPropagationMagazine,2003,45(6):1482154.(1969-),,,:(768)[12],,.[J]..2006,21(6):8732877.JinRH,YuanZH,GengJP,etal..ThepatternsysthesisofantennasbasedonamodifiedPSOalgo2rithm[J].ChineseJournalofRadioScience.2006,21(6):8732877.(1983-),,,2004,,(1946-),,,,,,,,,IEEE:,,,,(791)[11]HeathJr.RW,PaulrajAJ.Antennaselectionforspatialmultiplexingsystemsbasedonminimumerrorrate[C].IEEEInternationalConferenceonCommu2nications,Helsinki,Finland,June,2001,227622280.[12]GolubGH,VanLoanCF.Matrixcomputations[M].TheJohnsHopkinsUniversityPress,1996.[13]WilkinsonJH.Householder’smethodforsymmetricmatrices[J].NumerischeMathematik,1962,4(1):3542361.[14]GoreDA,HeathJr.RW.Transmitselectioninspatialmultiplexingsystems[J].IEEECommunica2tionsLetters,IEEE,USA,Nov,2002,6(11):4912493.[15].[M].:,2004.(1981-),,,,(1957-),,,,,(1979-),,,,,20823