电磁波在导电媒质中传播的计算机仿真-杨宏伟

杨宏伟(南京农业大学理学院物理系,江苏南京210095):Maxwell,,,,,,,,:;;;:O451;TP391.9:A:1002-4956(2010)02-0060-03ComputersimulationofelectromagneticwavepropagationinlossydielectricmediaYangHongwei(DepartmentofPhysics,NanjingAgriculturalUniversity,Nanjing210095,China)Abstract:Thepropagationofsinusoidalwaveissimulatedindifferentlossydielectricmedia,suchasmetalcu-prum,humanmuscle,earthanddistilledwater,byusingfinite-differencetime-domainmethodthroughdiscre-tedMaxwell.sequations.Thesimulationresultsexhibitthewavepropagationprocess.Theseresultscanhelpusexplainthewavepropagationindifferentlossydielectricmediaandexplainsomephenomenainourlife.Bychangingtheinputparametersappropriately,thecomputerprogramcancarryoutdifferentpropagationshapesofwave.Thearithmeticiseasytoberealized,andconvenientinteaching.Keywords:electromagneticwave;propagation;media;computersimulation:2009-05-25:(2008-433-JP-2):(1963)),,,,,,:.,,,,,[1-2],,,,,,,,1Maxwell[3]:@H=E0Er5E5t+J(1)@E=-L05H5t(2),E,H,E0L0,Er,R,J,,,RE,J=RE(3)Z,(1)(2),,Yee[4]:En+0.5x(k)=1-$tR/(2E0Er)1+$tR/(2E0Er)En-0.5x(k)-ISSN1002-4956CN11-2034/TExperimentalTechnologyandManagement27220102Vol.27No.2Feb.2010$t/($zE0Er)1+$tR/(2E0Er)(Hny(k+0.5)-Hny(k-0.5)(4)Hn+1y(k+0.5)=Hny(k+0.5)-$t$zL0(En+0.5x(k+1)-En+0.5x(k))(5)k/0,n/0,,n+1,,Mur[5],:E(t)=E0sin(2Pft)(6),f,t,E02Z150,$z=1cm,$t,$t=$z/(2c),c,,5f=800MHz,,,,R/(2PfE0Er),:R/(2PfE0Er)m1;R/(2PfE0Er)U1;R/(2PfE0Er)n1,,50,(),T10010001500,,T=100,1f=800MHz,,,,,,(),,,,/0,(),,(),2,T10010001500,(),,,1,,,(,,),(,),:,,,,,,23,,,,,,,,,,,,61:,,,,,,,,,,,,,343,Er,R,,,Er,,/0,41)4,,R/(2PfE0Er),,,,;,R/(2PfE0Er),,,,,,[6-8]3Maxwell,,,,,,,,,,,(References):[1].[M].:,2006.[2].[M].5.:,2006.[3],.[M].:,2000.[4]YeeKS.Numericalsolutionofinitialboundaryvalueproblemsin-volvingMaxwell.sequationsinisotropicmedia[J].IEEETransac-tionsonAntennasandPropagation.1966,14(3):302-307.[5]MurG.Absorbingboundaryconditionsforthefinite-differenceap-proximationofthetune-domainelectromagnetic-fieldequations[J].IEEETransactionsonElectromagneticCompatibility,1981,23(4):377-382.[6].[J].,2005,22(10):104-106.[7],,.[J]..2006,23(3):65-67.[8],.[J].,2008,25(12):54-57.62