标签: 环形天线设计

Thisapplicationnotedescribesthedesignofasingle-endedloopantennaforrfPIC12F675transmitters.ThePCBdesignwillcoverall3frequencybandsfrom290MHzthrough930MHzwithafewcomponentvaluechanges.ThepreviousMicrochipRFtransmittershadbalancedoutputswhichrequiredtwiceasmanycomponentstobiasthepoweramplifierandmatchimpedance.TherfPIC12F675usesfewercomponents,deliversalmost10dBmoreoutputpowertotheantenna,andincreasesthemaximumfrequencyto930MHz.AN868DesigningLoopAntennasfortherfPIC12F675ThisapplicationnotealsodocumentsthetuningandtestingoftheantennadesigntoavoidamanufacturingAuthor:MyronLoewenstepfortuning.ApictureofthefinishedboardisshownMicrochipTechnologyInc.inFigure1.FormoredetailsonRFregulatorylimitsandcompliancetestingseeApplicationNoteAN242,……