DP-100偶极子天线使用说明.pdf

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1、DP-100halfwaveDipoleAntennaManual一、产品简介：偶极子天线是一种无线通信用天线，它由铝、铜、青铜管与中心馈电驱动元件。它由两个金属导体杆，彼此的取向平行和共线（在相互一致），它们之间的一个小的空间。射频电压被施加到所述天线的中心，两个导体之间。这些天线从理论的角度来看是最简单实用的天线。它们可以单独使用的天线，特别是在传统的“兔耳”电视天线，并在许多其它类型的天线，如八木作为驱动元件。由德国物理学家海因里希·赫兹发明的，约1886年在他的开创性实验用无线电波偶极天线。1Radiationpatternofahalf-wavedipol

2、eantenna,scaleislinearTheGainofahalf-wavedipole(sameasabove).2ThescaleisindBi(decibelsoverisotropic).Manypeoplehavehadsuccessinfeedingadipoledirectlywithacoaxialcablefeedratherthanaladder-line.However,coaxisnotsymmetricalandthusnotabalancedfeeder.Itisunbalanced,becausetheoutershieldisc

3、onnectedtoearthpotentialattheotherend.Whenabalancedantennasuchasadipoleisfedwithanunbalancedfeeder,commonmodecurrentscancausethecoaxlinetoradiateinadditiontotheantennaitself,andtheradiationpatternmaybeasymmetricallydistorted.Thiscanberemediedwiththeuseofabalun.1.AntennaGainInformation:

4、Thisantennagainchartshowsthemaximumtheoretical(minusasmallallowanceforsystemlosses)gainachievablefromarraysofcloselyspacedco-lineardipoleelements.Dimensionsshownareforelementsalmosttouching;theactualheightsmaybeslightlymoreduetophasingnetworksusedbetweenthedipoleelements.Table1.12.Asse

5、mble&Install1).Howtoassembletheantennaelements:3Figure1.1A.InserttheelementsintotheTtubewithcorrespondingpolaritypositive(+)topositive(+)andnegative(–)tonegative(-)B.Wheninsertedscrewitwiththemetalscrewasyouseeinfigure1.1C.Asyoufinishassemblingtheantennaitlooklikeatthefigure1.2inthepic

6、ture4Figure1.22).Tuning/calibratingtheDipoleAntenna:A.SelecttheFrequencyyouwouldliketouseasyoucanseefrequencywithcorrespondingscaleofelements.figure1.3B.Whenyouhaveselectedthefrequencywearereadytotune/calibratetheelement.a)Firstweloosentheboltandnutoftheelementaswecanseeinfigure1.3b)Th

7、enadjusttheadjustableelementtoitscorrespondingfrequencyscalec)Wecantightentheboltandnutsineveryelements.Nowwecanmountittoyourtower.3).Installthedipoleantennaittoyourtowerorpost:A.InserttherodoppositeT-tubeendtothemetalfixture,checkthepicturebelow:5B.UnscrewtheUclipsandinsertthetwoUcl