13-56MHz天线匹配网络快速设计

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:2012-10-22Smith13.56MHz,,,,(,350007):NXP13.56MHz,,。NXP,、、、,13.56M。:Smith;13.56MHz;;;RapidDesignof13.56MHzAntennaMatchingNetworkBasedonSmithChartCHENYin-yan,CAIJian-yong,DAICai-yan,LINLi-jin,ZHUYu(CollegeofPhotonicandElectronicEngineering,FujianNormalUniversity,Fuzhou,350007,China)Abstract:Accordingtothe13.56MHzreaderantennamatchingnetworktopologygivenbyNXPcompanies,thepapergivedetaileddesignprocessofthisnetworkparameterswiththeaidofSmithchart.ComparedwiththetheoreticalformulacalculationmethodwhichNXPcompanyputforward,Smithchartmethodismorerapid,simple,intuitive,easytounderstand.Anditisbettertoachievethe13.56Mhighfrequencyreaderloadimpedanceandsourceimpedanceconjugatematching.Keywords:SmithChart;13.56MHz;Antenna;Matchnetwork;conjugatematchin、、、、[1]。,,[2]。,。,,,。1[3]。,Γ。z。τ(z)=τr+jτi(1)z=1+τ(z)1-τ(z)=r+jx(2)r,x。(1)(2)(τr-r1+r)2+τi2=(11+r)2(3)(4)(3)(11+r,0),11+r。(4)(1,1r),1r。。,180°,。。213.56M2.1[4]1。Lpa,fnat。(5)Cpa。fnat=12π(Lpa·Cpa)姨(5)Q,()。。Q,,。Mifare,T=3μsMiller[5]。B=fQ,:B·T≥1,Q≤f·T,Q≤13.56MHZ·3μs,Q≤40.68[6]。Q,(9)RQ。RQ=0.5·(ωLaQ-Ra)(6)2.2[7]2,L0C0,13.56MHz、,。C1C2,,。EMC,L0390nH1μH,13.56MRFID847KHz[8],L0C0fr14.408MHz。C0=1(2πfr)2·L0(7)L0C0,Ztr。Ztr=Rtr+Xtr(8)Rtr=Rmatch(1-ω2L0C0)2+(ω·Rmatch2·C0)2(9)Xtr=2·ωL0·(1-ω2L0C0)2-Rmatch4C0(1-ω2L0C0)2+(ω·Rmatch2·C0)2(10)Rtr,(14)(15),C1C2。C1≈1ω·(Rtr·Rpa4姨+Xtr2)(11)1213.56MC2≈1ω·Lpa2-1ω·Rtr·Rpa4姨-2Cpa(12)2.33,Rpa=7148Ω,Cpa=11pF,Lpa=2.9μH。L0560nH,14.3MHz,(7),C0=220pF。(9)(10),Rtr=217Ω,Xtr=-58Ω。Ztr=(217-j58)Ω。RpaXtr,(11)(12),C1=19.8pF,C2=54.1pF。3Smith,A(A),A。,A。,,,[9]。3.1L0C0SmithEMC,Ztr=(216.67-j57.92)Ω。2,L0,C0Rmatch/2,L0,C0Rmatch/2=25ΩZtr2=(108.3-j28.96)Ω。Z0=50Ω,Y0=150s。Zs=zsz0=0.5,ZL*=2.17+j0.58。,yL*=0.42-j0.11。Smith。2,C0L0。Load(yL*=0.42-j0.11)(y=0.42+j0.82,z=0.5-j0.96),Source(Zs=0.5)。4。Load,C0,jωC0Y0=j[(0.82-(-0.11)]=j0.93,C0=216pF。Source,L0,jωL0Z0=j[0-(-0.96)]=j0.96,L0=563nH。3.2C1C2Smith,Zant=14.45+j321.12Ω,2,C1C2,C1,C2ZtrzZant2=7.23+j160.56Ω。Zs=2.17-j0.58,Zs*=2.17+j0.58,ys*=0.42-j0.11。ZL=7.23+j160.550=0.145+j3.21,yL=0.014-j0.31。。2,346SmithC2C1。Load(yL=0.014-j0.31)(y=0.014-j0.08,z=2.18+j13.10),Source(Zs*=2.17+j0.58)。Load,C2,jωC2Y0=j[-0.08(-0.31)]=j0.23,C2=54pF。Souce,C1,-jωC1Z0=j(0.58-13.10)=-j12.523.3C1=18pFC2=56pF。5,6。40.66Ω+j0.01Ω,0,。13.56MRC522,40Ω[10],13.56M。4,Smith。13.56MSmith,,Smith,,13.56M。[1],.ISO1443ARFID[J]..2011,11(7):4-6[2]K-CChan.[J]..2001,31(12):51-53[3],,.[M].:,2005[4]NXP.AN1425_AN166510-RFAmplifierforNXPCon-tactlessNFCReaderICs.20110802.[5]ISO/IECFDIS14443-2:2000E(S).1999[6].MFRC500[EB/OL].[7]NXP.AN1445_AN1444-AntennadesignguideforMFRC52x,PN51xandPN53x.20101011.[8]SchochiMasui,EiichiIshii,TakanoriIwawaki,etal.A13.56MHzCMOSRFIdentificationTransponderInte-gratedCircuitWithADedicatedCPU[C].ISSCC1999.[9].[M].:,2008.[10]PhilipsSemiconductors.MFRC522(1989),,,,,。5

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