自制2.4ghz全向天线分步指南

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1、自制2.4GHz全向天线分步指南EasyHomemade2.4GhzOmniAntenna自制2.4Ghz全向天线分步指南Aneasystep-by-stepguidegomakingahomemadewirelessantenna,forafractionofthecostofcommercialantenna.Usesreadilyavailableparts,andrequiresnospecialisttoolsorknowledge.Oringeekspeak-adiyhomebrewomnidirectionalcolineardipolede

2、signsuitablefor802.11wificompatiblehardwarewithexternalantennaconnector.一个简单的分步指南带我们自制无线天线，其成本只是商业天线的一小部分。使用现成的零件，而无需专门的工具和知识。或者如geek所说——一个自制的全向的共线偶极子，设计与802.11兼容的无线外接天线。•Introduction•GettingTheParts•CuttingThePieces•BuildAJig•Testing•Problems•DisclaimerIntroduction介绍Mostofthedesi

3、gnsonthewebfor2.4GHzomniantennaseemtoinvolvebrasstubingandlmr-400cable,noneofwhicharereadilyavailabletome.Ithenfoundacoaxonlydesignfor444Mhzthatwasbasedonthesameidea.TheonlyreasonablecableIcouldgetmyhandsonwasRG-213fromMaplin.Byscalingthe444Mhzdesignupto2.4GhzandusingRG-213Ithough

4、tI'dhaveago.Inordertogetabout6dbgainfromtheantenna,itwouldneed8sectors,witha1/4wavesectionatthetopandafly-leadwithN-connectoratthebottom.Itshouldtakeabout2-3hourstobuildanantennausingthisdesign,butdon'tworryifittakeslonger,youwillgetquicker,especiallyasyouonlyneedtomakethejigonce.

5、大多数网络设计的2.4GHz的全向天线，似乎大部分涉及铜管材和LMR-400同轴电缆，对我都不适用。后来我发现了一个只使用同轴电缆的为444Mhz设计的天线，而我手头正好就有从Maplin买的RG–213同轴电缆。就采用我已有的RG-213，把444Mhz的设计扩大至2.4GHz。为了使天线获得大约6dB的增益，上端需要有1/4波长的电缆8截，底部有一个带N型连接器的引线。采用该设计建造一个天线大约需要2-3小时，如果你不想花费太多的时间，你只需要制作一个模具，就会做的更快。1自制2.4GHz全向天线分步指南Mostofthedesignseitherha

6、dtoroidmagnetsoradecoupleronthefly-leadoftheantenna.Howeverthelocationofthedecouplerseemsdifferentineachdesign,andsomedesignsquotedadecouplerlengthof1/4wavelength,otherswere!/4wavelengthtimesthevelocityfactorofthedecouplertube(brasstubequotedat0.95).I'vetriedmostlocationsandcanrep

7、ortthatwithoutpropertestingkitIcanseenodifferenceintheSignaltoNoiseratiobetweenhavingadecouplerandnot.Idecidedtonotbotherasitsimplifiedthedesign.IfanyoneknowsagoodreasonwhyyoumusthaveadecouplerthenIwouldlovetoknow(especiallyifyouknowwhereitshouldbeexactly).Ifyouwanttoaddadecoupler

8、,pleasedo,Ifoundusing15mmor22mmco