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1、INVITEDPAPERBroadbandElectromagneticCloakingRealizedWithTransmission-LineandWaveguidingStructuresThispapergivesabriefoverviewofcloakingtechniquesanddescribesanalternativeapproachforcloakingbasedontransmission-linemetamaterialsByPekkaAlitaloandSergeiA.Tretyakov,FellowIEEEABSTRACT
2、Electromagnetic
3、cloaking,or,inotherwords,ifwewanttomakeobjectsBinvisible[inacertainfre-techniquesmakingobjectsBinvisible[totheelectromagneticquencyrange,thegoalistominimizescatteringfromradiation,hasattractedmuchattentioninthelastfewyears.theseobjects.IfanobjectdoesnotcreateanyscatteredSeveraldifferentconcepts
4、havebeenproposedandstudiedfield,electromagneticmeasurementswillnotbeabletoanalytically,numerically,andevenexperimentally.Tomakedetectitspresence.Wesaythatanobjectiscloakedifitsobjects,especiallystrongscatterers,invisibletotheimpingingtotalscatteringcrosssectionisnegligible,sinceinthiselectromag
5、neticradiationisnotaneasytask.Inthispaper,wecase,itisundetectableformeasurementsatleastintheexplainhowtheconceptoftransmission-linemetamaterials,farzone.developedinthebeginningofthe21stcentury,canbeusedinTheproblemofminimizingscatteringfromvariousthecreationofaspecialclassofelectromagneticcloak
6、ingobjectshasalonghistory,especiallyinstealthtechnolo-devices.Wealsomakeanoverviewofotherapproachestogies.However,mostoftheearlyworkwasconcentratedonelectromagneticcloaking.reducingreflection,especiallythebackscattering(radar)crosssectionoftargets.Forcloaking,however,thetotalscatteredpowershoul
7、dbeminimized,sothatthereisnoKEYWORDS
8、Electromagneticcloak;invisibility;scatteringscatteredfieldinanydirection.Inadditiontozerocrosssection;scatteringwidthreflection,thisalsoimpliesthatacloakedobjectcreatesnoshadow.Obviously,theconventionalapproachestoI.INTRODUCTIONreducingradarcrosssectionoftar
9、getsorreflectivityofanechoicchamberwallscannotbeusedforcloaking:idealUsingthetechnicalmeansofradioengineeringandoptics,cloakmustbelosslessandfullytransparent.thepresenceandpropertiesofmaterialobjectscanbeRecently,cloakingreceivedm
