pcb天线设计参考(TI公司)

DesignNoteDN031SWRA328Page1of55CC-Antenna-DKandAntennaMeasurementsSummaryByRichardWallaceKeywords•169MHz(136–240MHz)Antenna•315MHz(273–348MHz)Antenna•433MHz(387–510MHz)Antenna•868MHz(779–960MHz)Antenna•915MHz(779–960MHz)Antenna•2440MHzAntenna•PCBAntenna•WireAntenna•CeramicChipAntenna•CC-Antenna-DK•DualBandAntenna(868&2440MHz)•MitsubishiChipAntenna•PulseChipAntenna•HelicalWireAntenna•PulseHelicalWireAntenna1IntroductionThemainpurposeoftheCC-Antenna-DKistoeasethedecisionforwhichtypeoflowcostantennacanbeimplementedaswellasgiveanestimationoftheperformancethatcanbeachieved.Thefrequencyrangeoftheantennasisfrom136MHzto2480MHz.TheA4sizedPCBpanelcontains16differentboards;13antennadesignsand3boardsforcalibrationpurposes.Eachboardhasbeenv-cutandcanbesnappedoutofthePCBpanel.AllantennasaretunedforconnectingtoanEMboardontheEBplatform.AmatchingnetworkisusedoneachantennadesignsotheantennaboardscanmatchedforotherGNDsizesthantheEBboard.Additionally,theambitionwiththisdocumentistocollectthevariousantennameasurementsthathavebeenperformedandtocomparetheresultsobtainedinanoverviewformat.Terminology,antennacharacteristics,fundamentalsofantennadesign,andmeasurementproceduresarecoveredintheAntennaSelectionGuide[18].Foreachantenna,aCTIAmeasurementsummaryisprovidedinthisreportwithalinktothefullmeasurementCTIAreport.DN6xxisdesignatedforCTIAmeasurementreports.Choosingthecorrectantennafortheapplicationiscrucialiftheoptimumrangeistobeachieved.Similarly,foragivendistance,thepowercanbereducedonthetransmittersideiftheoptimumantennaischosen.Antennasarecategorizedundertheoperatingfrequency(169MHz,315MHz,433MHz,868/915MHzor2.44GHz)andthenthetypeofantenna(PCBAntennas,ChipAntennas,andWireAntennas).ThemainfocusisonPCB,WireandChipantennas,sincethesearemainlyusedinhighvolumeproducts.DesignNoteDN031SWRA328Page4of553CC-Antenna-DKRev1.0.0.3.1BoardDescriptionTheCC-Antenna-DKPCBpanelcontains16differentboards;13antennadesignsand3boardsforcalibrationpurposes.Eachboardhasbeenv-cutandcanbesnappedoutofthePCBpanel,showninFigure1.Eachboardhasaheightof95mmandawidthof20mmto45mm.ThePCBis1.6mmthickandhasadielectricof4.2.Theschematic(PDF),layout(PDFandgerbers),PCBstack-up(PDF)areprovidedintheCC-Antenna-DKdocumentationinthezipfile[19].Figure1:CC-Antenna-DKBoardShowingTopMetalLayer,SilkscreenandV-cutTrackAllLowPowerWirelesschipshavetheirownspecificreferencedesigns.EachreferencedesignisimplementedonanEvaluationModule(EM).Figure2showsatypicalEMthatisusedforCC2500refdesign.Figure2.PictureofCC2500EvaluationModule(EM)DesignNoteDN031SWRA328Page5of55TheEMboardisinsertedontothemainEvaluationBoardplatformsothereferencedesignimplementedontheEMcanbeevaluated.TheEMboardisinsertedontothetop,rightsideoftheSmartRF04EBboardascanbeseeninFigure3.Figure3.PictureofSmartRF04EBEvaluationBoard(EB)AllantennashavebeenmeasuredandtunedforconnectingtoanEMboardinsertedontoanEBboardunlessotherspecified;thisisillustratedinFigure4.Figure4:ConnectivityofAntennaBoard#6toaCC1101EMBoardontheEBPlatformDesignNoteDN031SWRA328Page6of55AmatchingnetworkisusedoneachantennadesignsotheantennaboardscanmatchedforotherGNDsizesthantheEBboard,refertoFigure5.Figure5:CC-Antenna-DKPanelPictureSections3.1.1to3.1.16showthetopmetallayerinblueandthebottomlayerinred.Theefficiencyoftheantenna(868MHz)isnormallyincreasedwhenusedasastandaloneboard.Thelowerfrequencies(433MHz)requirealargerGNDplane/antennatoachievehightotalradiatedpower(TRP).Twotypesofantenna(board6,3.1.6andboard7,3.1.7)havebeenchosentoillustratethattheTRPisincreasedwhenusedasastandalonecomparedtousingtheantennasontheEM&EBplatform.DesignNoteDN031SWRA328Page7of553.1.1Board#1:“Short”CalibrationBoardFigure6:Board#1–“Short”CalibrationBoardSizeWidth(mm)Height(mm)PCBBoard2095GND1863BOMRef.DesignatorPartNumberValue---Table1:PCBSizeandBOMforBoard#1–“Short”CalibrationBoardThreeboardshavebeenprovidedforcalibrationpurposes;OPEN(3.1.9),SHORT(3.1.1),and50ohmLOAD(3.1.2).Theseboardsaremainlyusedwhenworkingwithanetworkanalyzer.DesignNoteDN031SWRA328Page8of553.1.2Board#2:“Load”CalibrationBoardFigure7:Board#2–“Load”CalibrationBoardSizeWidth(mm)Height(mm)PCBBoard2095GND1863BOMRef.DesignatorKoaPartNumberValueR21RK73H1ETTP1000F100ohmR22RK73H1ETTP1000F100ohmTable2:PCBSizeandBOMforBoard#2–“Load”CalibrationBoardThreeboardshavebeenprovidedforcalibrationpurposes;OPEN(3.1.9),SHORT(3.1.1),and50ohmLOAD(3.1.2).Theseboardsaremainlyusedwhenworkingwithanetworkanalyzer.DesignNoteDN031SWRA328Page9of553.1.3Board#3:MitsubishiChipAntenna–868MHzFigure8:Board#3:MitsubishiChipAntenna–868MHzSizeWidth(mm)Height(mm)PCBBoard3095GND2863BOMRef.DesignatorPartNumberValueA3MITSUBISHIAMD1103-ST01T-Z31NC-Z32MurataLQG15HS22NJ02D22nHZ33KOARK73Z1ETTP0ohmTable3:PCBSizeandBOMforBoard#3:MitsubishiChipAntenna–868MHzPros:GoodBWandeasytomatch.DesignNoteDN031SWRA328Page11of553.1.4Board#4:PulseChipAntenna–868MHzFigure10:Board#4:PulseChipAntenna–868MHzSizeWidth(mm)Height(mm)PCBBoard3595GND3393BOMRef.DesignatorPartNumberValueA4PULSEW3013-Z41KOARK73Z1ETTP0ohmZ42NC-Z43MurataGRM1555C1H8R2CZ01D8.2pFTable4:PCBSizeandBOMforBoard#4