15 Wire Media

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1、FilippoCapolino/TheoryandPhenomenaofMetamaterials_CFinalsPage--#15WireMedia.Introduction.........................................-.EffectiveMediumModelandStrongSpatialDispersioninWireMedia............................-PlasmaFrequencyforWireMedia●SpatialDispersion●Inconsi

2、stenceoftheLocalModel●NonlocalModelforaPeriodicArrayofє-NegativeRods.EffectiveMediumTheoryinUnboundedDouble-WireMedium................................-Modesintheyz-Plane●EvanescentModes●Propagationinthez-Direction●GroupVelocityandPoyntingVectorinDWM.EigenmodesinaWaveguideFilledwithWireMed

3、ium..............................................-I.S.Nefedov.ApplicationsofWireMedia..........................-CouplingReductioninAntennaArrays●AntennaLensesHelsinkiUniversityofTechnologyandOtherApplicationsA.J.Viitanen.Conclusion...........................................-Helsin

4、kiUniversityofTechnologyReferences.................................................-15.1IntroductionThewiremedium(ortheroddedmedium)consistingofatwo-dimensional(D)orthree-dimensional(D)rectangularlatticeoflow-losswiregrids(Figure.)hasbeenknownforalongtime,andithasbeenextensivelystudiedinmi

5、crowavelensdesign[–]andforthesynthesisofsurfacereactance[].Thegridsofresistivewireswereconsideredin[].Thesingle-wiremedium(WM)(Figure.a)isusuallydescribedatlowfrequenciesasauniaxialmaterial,whoserelativepermittivitydyadiccanbewrittenas(thewiresareinthez-direction)є=єh(uxux+uyuy)+єzuzuz,(.

6、)whereєzisexpressedbytheplasmaformula:ωkppєz=єh(−)=єh(−).(.)ωєhk√√Hereєhisthepermittivityofthehostmedium,k=ω/cєh=koєh,andcisthespeedoflight.Theconstantωp(orthecorrespondingkp)isanequivalent“plasmafrequency”thatgivesgroundstocallthewiremediumas“artificialplasma.”Differentmodelsexistforthepl

7、asmafrequency,whicharediscussedSection..Interestinwiremediawasrenewedattheendofthelastdecadeinconnectionwithengineer-ingofmaterialswithnegativeparameters,sometimescalleddouble-negativematerials(DNM).15-1