3D角反射天线作馈源的5.8GHz偏馈抛物面天线

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1、3D角反射天线作馈源的5.8GHz偏馈抛物面天线3DCornerReflectorAntennaasanefficientfeedforoffsetparabolicantennasfor5.8GHz3D角反射天线作馈源的5.8GHz偏馈抛物面天线DragoslavDobričić,YU1AWAbstract摘要InthisarticleIpresentamodificationof3DcornerreflectorantennainordertoadjustitfortheuseasafeedforSATTVoffsetparabolicantennason6cmHamb

2、andorWLANfrequenciesof5.8GHz.本文介绍用改进型3D角反射天线，为6厘米业余无线电通信频段STA卫星电视或WLAN频段5.8GHz频道的偏馈抛物面天线作馈源。Introduction引言Theproblemsthatoccurwhileilluminatingshallowoffsetparabolas,inadditiontothoserelatedtotheefficientuseofparabolicgenerally,areadditionallyaggravatedbythespecificgeometryoftheparabolicmi

3、rroritself.Feedpositioninginthewaythatitsphasecenterexactlycoincideswiththefocusoftheoffsetparabolaanditsdirectionsothattheradiationmaximumfallsinthegeometriccenteroftheellipticreflectorsurfacearenotintuitiveatall,asinclassicparabolicantennas.Therefore,thereareamanyconfusionsandwronglyposi

4、tionedfeedsthatdon'tcorrectlyilluminateoffsetaparabolicdish,decreasingitsefficacyandgain.这个问题时常存在于浅照射的偏馈抛物面天线上，除了和抛物面天线的效率有关之外，抛物线反射面本身的具体几何形状又使之更加严重。馈源用这样的方式定位——其相位中心准确位于偏馈抛物线反射器的焦点，方向也要准确，这样辐射最大值才能落在椭圆形反射面的几何中心，这样一点也不直观，正如标准的抛物面天线。因此，有许多混乱和错误放置馈源的方式，不能正确照射抛物柱面反射器，降低了其效率和增益。Classicandoffs

5、etparabola标准的和偏置的抛物面Aparabolicsurfaceorparaboloidisformedbyrotationofparaboliccurvearounditsaxisofsymmetry.Thespecificityofthesurfacegainedinthiswayisthatwhenthebeamofraysparalleltoitsaxisofrotationfallsonit,thebeamisreflectedsothatalltheraysmeetinonepoint,knownasthefocus,inthesamewaythato

6、pticallensesfocuslightraysintheirfocus.抛物线的表面或曰抛物面，是由抛物线围绕其对称轴旋转而成，其特点是，和抛物线对称轴平行的射线波束被抛物面所反射，所有的电波都在同一点汇聚，1September，20093D角反射天线作馈源的5.8GHz偏馈抛物面天线我们把这点叫做焦点。Whenthepieceofa(mathematicallyinfinite)surfaceofparaboloidiscutoff,aparabolicreflectorormirrorisgained.Cuttingoff(cropping)canbecarrie

7、doutinmanyways,butallofthemcanbeclassifiedintwogroups:thosewhosesurfaceofcroppingisperpendicularontheaxisofsymmetry,andthosewhosesurfaceofcroppingarenotperpendicular.Whentheplanethatcutsoffparaboloidisperpendicularontheaxisofsymmetry,aroundsegmentofparaboloidi