安捷伦ADSMomentum教程3（共4）：UsingMomentum

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1、DetailsofMomentum•Solutionprocess•SelectMode•Substratedefinition•PortSetup•MeshGeneration•PlanarSolve•DisplayResultsMomentumSeminarmomentum_01_03Page1DefiningMeshParametersMeshSetupControlGlobalmeshisthedefault.Butyouhavechoices.Ingeneral,smallpatternsaremoreaccuratebuttakemoretimetosolv

2、e.MomentumSeminarmomentum_01_03Page2DefiningMeshParametersGlobalMeshexamplewithEdgeMesh1-PortHere,thecellsizeisthesamefor2-CalibrationLineallpartsofthegeometry,exceptfortheedgesaroundeachprimitive.3-Mesh4-EdgeMesh243Thecalibrationlineisautomaticallydrawnwhentheportisdefined-moreonthislat

3、er.1NOTE:Youcanviewthemesh,ports,andreferencelinebeforesimulatingandmakeadjustmentsifdesired.MomentumSeminarmomentum_01_03Page3DefiningMeshParametersPrimitiveMeshexampleYoucancombineprimitivemesh,layermesh,andglobalmesh.Thecenterprimitiveofthisgeometryhasadifferentmesh(50cells/wavelength

4、)thanthetwooutsidegeometries(20cells/wavelength).12Next,let’sdiscussports...MomentumSeminarmomentum_01_03Page4DiscretionError-Longitudinal•Numberofcells/wavelengthdeterminessamplesusedforapproximationoftruecurrents•Typicalcells/wavelengthis20•30ormoreisfine,butwillslowdownthesimulation•M

5、inimumrequiredtoretainhigh-frequencyaccuracyis10•CanretainaccuracyANDspeedwith10cells/wavelengthANDedgemesh•Remember,canalsohavelayer-specificmeshes(orevenobject-specificmeshes)whichallowsfinermesheswhereneededandcoarsermesheswherecurrentdensityisnotashigh(suchasafinitegroundplane)Moment

6、umSeminarmomentum_01_03Page5EdgeMeshAccuracyMomentumSeminarmomentum_01_03Page6Mesh:MomentumversusMomentumRFMomentumRF&PolygonMesh•MeshingcomplexgeometrieswithPOLYGONALcells•Eliminates“slivery”triangles•EliminatesredundantR,L,Celements10•UncompromisedaccuracyforRFfrequenciescells•Strongly

7、reducedcomputermemoryreduction4•Stronglyreducedcomputationtimecells1reductioncellmeshtopologyMomentumSeminarmomentum_01_03Page7UsingMomentumMethodofMomentsB1(r)B2(r)B3(r)Maxwell’sEquationsIII312MatrixEquation≤λ/10•Solutionprocess[Z].[I]=[V]L1I1L123I2L23I3•SelectModeEquiva