IncidentandtransmitteddirectionsareautomaticallysetbytheFloquetmodes. TheincidentplanewaveangleandunitcellperiodicityoftheFSSarefreelyconfigurable.įoroff-normal incidentangles theFloquetportmodesensure that thereflectedwave is recorded in thedirectionofopticalreflection,whilethetransmissionisinthesamedirectionastheincidentwave.Thisiselucidatedbythefigurebelow. TheincidentangleoftheincomingplanewavemaybespecifiedbysettinganglesThetaandPhi,bothofwhichhavealreadybeenparameterizedby the template.Theperiodicityof theFSS isalso freelyconfigurableasshownbelow.Differentperiodicitiescanbeassigned in thex-andy-directions,andtheuseofaskewedlattice isalsopossiblebyspecifyingthegridangle(thiscanbeusefulforsimulatingcompactcloselycoupledarrays). Theconductingringisalossymetaltypecopper,andthesubstrateisArlonAD300witharelativepermittivityof3. Itisonlynecessarytoconstructasingleringonitsbackingsubstrate.Constructionofthegeometryitselfissimple:asubstrate is defined using a brick primitive object, and then a hollow cylinder can be used to create the ring. of 10FSS: Simulation of Resonator Arrayįile://D:\Installed Programs\CST Studio Suite 2014\Online Help\mergedprojects\exampl.įor the frequency selective surface, please select Periodic Structures FSS, Metamaterial - Unit cellĪtlastyouarerequestedtoselecttheunitswhichfityourapplicationbest.Forthefrequencyselectivesurface,pleaseleavethesettingsasfollows:įorthespecificapplicationin this tutorialtheothersettingscanbeleftunchanged.In ,youcangivetheprojecttemplateanameandreviewasummaryofyourinitialsettings:įinallyclicktheFinishbuttontosavetheprojecttemplateandtocreateanewprojectwithappropriatesettings.CSTMICROWAVESTUDIOwillbelaunchedautomaticallyduetothechoiceoftheapplicationareaMicrowaves & RF. Nextyoushouldchoosetheapplicationarea,whichis Microwaves & RFfortheexampleinthistutorialandthenselecttheworkflowbydouble-clickingonthecorrespondingentry. There is no need to define master and slave boundary conditions the phaserelationoftheopposingboundariesisautomaticallysetbyspecifyingtheincidentangleoftheinwardtravellingplanewave.ĪfterlaunchingtheCSTSTUDIOSUITEyouwillenterthestartscreenshowingyoualistofrecentlyopenedprojectsandallowingyou to specify theapplicationwhichsuits your requirementsbest.Theeasiestway togetstarted is toconfigureaprojecttemplatewhichdefinesthebasicsettingsthataremeaningfulforyourtypicalapplication.ThereforeĬlickontheCreate Projectbutton intheNew Projectsection. The simulationofanentirearrayof resonant ringswouldbeprohibitively -UnitCell(FD)template,whichautomaticallyappliesunitcellboundaryconditionsinthex-andy-directionsandsetsupFloquetportexcitationsinthepositive and negative z-directions.
In thisexampleanarrayoffullwavelengthresonantconductingringsonadielectricsubstrate issimulated.SincetheFSSwouldbeusedoncurvedstructureslikeradomes,itisdesirablethattheFSShavethesameresonantfrequencyforallincidentplanewaveangles.Foragivenpolarisation,ringresonatorsareknowntobestablewiththescanangle.CSTMICROWAVESTUDIO(CSTMWS)canbeusedtoestablishtheangulardependenceoftheresonantfrequency.ĬST MICROWAVE STUDIO Model: Parameter definition and preliminary settings A simple unit cell of a ring resonator band-stop infinitearrayisconsideredasanexample.įrequency selective surfaces are increasingly used for the frequency filtering of plane waves in radar orcommunicationssystems.Aone-ortwo-dimensionalperiodicarrayofresonantstructuresonabackingmaterial,eitherapertures inametallic sheet ormetallic patchesona substrate,actsasa filter fora planewavearriving from anyangleof incidence.
The increasing interestwithin the high-frequency community in this sortof structure has alsomade itsaccuratesimulation increasingly important.This tutorialdescribeshowanFSSstructuremaybesimulatedefficiently using CST MICROWAVE STUDIO (CST MWS). AFrequencySelectiveSurface(FSS)isaperiodicassemblyofone-ortwo-dimensionalresonantstructures,eitherasaperturesinathinconductingsheetorasmetallicpatchesonasubstrate,whichmayhaveaband-passorband-stopfunction respectively.
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