摘要：作为一个在FOB短路或开环小孔径超高频天线用于远程无钥门禁（RKE）应用，可以终止。取决于如何终止循环，其远场模式和天线的特性阻抗会受到影响。Maxim>AppNotes>AutomotiveKeywords:UHFantenna,RKE,remotekeylessentryMar26,2006APPLICATIONNOTE3621SmallLoopAntennas:Part1―SimulationsandAppliedTheoryAbstract:Small-apertureUHFantennasforremote-keyless-entry(RKE)applicationscanbeterminatedeitherasashortedoropenloopwithinafob.Dependingonhowtheloopisterminated,itsfar-fieldpatternandtheantenna'scharacteristicimpedancewillbeinfluenced.InthisapplicationnotewewillexploreantennatheoryanddesignusingEZNEC,aneasy-to-useantennasimulator.Wewillmeasuretheantenna'scharacteristicimpedancethroughourapplicationboard.Theresultswillshowthetradeoffsbetweenopenandshortedloops,theeffectsoftheground
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