08_2_a_hfss_si_segmentedgnd

8/6/2019 08_2_a_hfss_si_segmentedgnd

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AnsoftHighFrequencyStructureSimulatorv11UsersGuide 8.2a-1

8.2a

SegmentedReturnPathThisexampleisintendedtoshowyouhowtocreate,simulate,andanalyzeatrace

overaslotinthegroundplantusingtheAnsoftHFSSDesignEnvironment.

LAYER1(SIGNAL1)

LAYER2(BOTTOMSIDE)

1.3mm

Nominal Design:Board:Thickness= 1.3mmr= 4.5

Trace: Length= 8.2cmTermination: 47

8mm

4cm

5cm 6mm 3.4cm 1cm

1cm

3mm

6cm


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8.2a

AnsoftHFSSDesignEnvironmentThefollowingfeaturesoftheAnsoftHFSSDesignEnvironment areusedtocreate

thispassivedevicemodel

3DSolidModeling

Primitives:Box, RectanglesBooleanOperations:Subtract

Boundaries/ExcitationsPorts:Lumped PortBoundaryConditions:Lumped RLC, PML

Analysis

Sweep: Interpolating SweepResults

Cartesian and Smith Chart plottingFieldOverlays

Magnitude and Vector Field PlottingAnimation


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8.2a

DesignReviewBeforewejumpintosettingupthisdeviceletsreviewthedesign.

TraceWidth=3mm

TraceLength=8.2cm

DielectricHeight=1.3mm

PortSize/Type=???

FreeSpace=PMLorRadiationBoundary

PortSize/TypeSincethetraceisinternaltothemodel,letsusealumpedgapsourceport

TraceThickness/MaterialProperties

Tostartletsmakeanengineeringassumptionthatthetracethicknessandconductivitywillnothaveanimpactontheperformanceofthedevice.Thiswillspeedupthesimulation.

FreeSpace

Weshouldexpectsomeradiationtooccurbecauseoftheslotintheground,

however,itshouldnotbeverystrong.Becausethereislimited radiationtheseparationfromthedeviceandthefree-spaceboundarycanbekepttoaminimum.Theincidenceangleoftheradiationisunknown,thereforeweshoulduseaPML.Themaximumspacingwillbe~/[email protected]


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8.2a

GettingStarted

Launching Ansoft HFSS1. ToaccessAnsoftHFSS,clicktheMicrosoftStart button,selectPrograms,andselect

theAnsoft, HFSS 11 programgroup.ClickHFSS 11.Setting Tool Options

To set the tool options:Note: Inordertofollowthestepsoutlinedinthisexample,verifythatthefollowingtooloptionsareset :

1. SelectthemenuitemTools > Options > HFSS Options2. HFSSOptionsWindow:

1. ClicktheGeneral tabUseWizardsfordataentrywhencreatingnewboundaries: CheckedDuplicateboundarieswithgeometry: CheckedAuto-assignterminalsonports:: Checked

2. ClicktheOK button3. SelectthemenuitemTools > Options > Modeler Options.4. ModelerOptionsWindow:

1. ClicktheOperation tabAutomaticallycoverclosedpolylines: Checked

2. ClicktheDrawing tabEditpropertyofnewprimitives: Checked

3. ClicktheOK button


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8.2a

Opening a New ProjectTo open a new project:

1. InanAnsoftHFSSwindow,clickthe OntheStandardtoolbar,orselect

themenuitemFile > New .2. FromtheProject menu,selectInsert HFSS D esign.

Set Solution TypeTo set the solution type:

1. SelectthemenuitemHFSS > Solution Type2. SolutionTypeWindow:

1. ChooseDriven Terminal2. ClicktheOK button


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8.2a

Creatingthe3DModel

Set Model UnitsTo set the units:

1. SelectthemenuitemMode ler > Units2. SetModelUnits:

1. SelectUnits:cm2. ClicktheOK button

Set Default MaterialTo set the default material:

1. Usingthe3DModelerMaterialstoolbar,chooseSelect2. SelectDefinitionWindow:

1. ClicktheAdd Material button2. View/EditMaterialWindow:

1. FortheMaterial Name type:My_FR42. FortheValue ofRelative Permittivity type:4.53. ClicktheOK button



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8.2a

Create BoardTo create the board:

1. SelectthemenuitemDraw > Box2. Usingthecoordinateentryfields,entertheboxposition

X:0.0,Y:0.0,Z:0.0,PresstheEnter key3. Usingthecoordinateentryfields,entertheoppositecornerofthebase

rectangle:

dX:6.0,dY:10.0,dZ:-1.3mm,PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Board3. ClicktheOK button

To fit the view:SelectthemenuitemView > F it All > Active View . OrpresstheCTRL+D key

Create GroundTo create ground:

1. SelectthemenuitemDraw > Rectangle2. Usingthecoordinateentryfields,entertheboxposition

X:0.0,Y:0.0,Z:-1.3mm,PresstheEnter key3. Usingthecoordinateentryfields,entertheoppositecornerofthebase

rectangle:

dX:6.0,dY:10.0,dZ:0.0,PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Ground3. ClicktheOK button

To fit the view:1. SelectthemenuitemView > Fit All > Active View.


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8.2a

Create Offset Coordinate SystemTo create an offset Coordinate System:

1. SelectthemenuitemModeler > Coordinate System > Create >Relative CS > Offset

2. Usingthecoordinateentryfields,entertheorigin

X:0.0,Y:5.0,Z:-1.3mm,PresstheEnter key

Create Ground Cut OutTo create cut out:1. SelectthemenuitemDraw > Rectangle2. Usingthecoordinateentryfields,entertheboxposition


rectangle:

dX:4.0,dY:6.0mm,dZ:0.0,PresstheEnter keySelect Ground & Rectangle1:

1. SelectthemenuitemEdit > Select > By Name2. SelectObjectDialog,

1. Selecttheobjectsnamed:Ground, Rectangle12. ClicktheOK button

To complete the ground object:1. Selectthemenuitem3D Modeler > Boolean > Subtract2. SubtractWindow

BlankParts:GroundToolParts:Rectangle1Clonetoolobjectsbeforesubtract: UncheckedClicktheOK button


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8.2a

Assign a Perfect E boundary to the GroundTo select the ground:


1. Selecttheobjectsnamed:Ground2. ClicktheOK button

To assign the Perfect E boundary1.

Selectthemenuitem HFSS > Boundaries > Assign > Perfect E2. PerfectEBoundarywindow

1. Name:PerfE_Ground2. ClicktheOK button

Set Working Coordinate SystemTo set the working coordinate system:

1. Selectthemenuitem3D Modeler > Coordinate System > Set Working CS2. SelectCoordinateSystemWindow,

1. Fromthelist,selecttheCS:Global2. ClicktheSelect button

Create Offset Coordinate SystemTo create an offset Coordinate System:

1. Selectthemenuitem3D Modeler > Coordinate System > Create >Relative CS > Offset

2. Usingthecoordinateentryfields,entertheorigin

X:1.0,Y:8.0mm,Z:0.0,PresstheEnter key


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8.2a

Create TraceTo create trace:



rectangle:

dX:3.0mm,dY:8.2,dZ:0.0, PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Trace3. ClicktheOK button


Assign a Perfect E boundary to the TraceTo select the trace:


1. Selecttheobjectsnamed:Trace2. ClicktheOK button

To assign the Perfect E boundary1. Selectthemenuitem HFSS > Boundaries > Assign > Perfect E2. PerfectEBoundarywindow

1. Name:PerfE_Trace2. ClicktheOK button


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8.2a

Set Grid PlaneSelectthemenuitemModeler > Grid Plane > XZ

Create SourceTo create source:



rectangle:

dX:3.0mm,dY:0.0,dZ:-1.3mm,PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Source3. ClicktheOK button



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8.2a

Assign ExcitationTo select the object Source:


1. Selecttheobjectsnamed:Source2. ClicktheOK button

Note:YoucanalsoselecttheobjectfromtheModelTreeTo assign lumped port excitation

1. Selectthemenuitem HFSS > Excitations > A ssign > Lumped Port2. ConductingObject:Trace3. ReferenceConductors:Ground4. ClickOK

Set the name for excitations:1. ExpandtheExcitations inProject Manager2. Clickon LumpPort1.3. ChangetheName intheProperties window:p1


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8.2a

Create Offset Coordinate System1. SelectthemenuitemModeler > Coordinate System > Create >

Relative CS > Offset2. Usingthecoordinateentryfields,entertheorigin

X:0.0,Y:8.2,Z:0.0,PresstheEnter keyCreate Resistor

To create source:1. SelectthemenuitemDraw > Rectangle2. Usingthecoordinateentryfields,entertheboxposition


rectangle:

dX:3.0mm,dY:0.0,dZ:-1.3mm,PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Resistor3. ClicktheOK button



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8.2a

Assign Lumped RLCTo select the object Resistor:

1.SelectthemenuitemEdit > Select > By Name2.SelectObjectDialog,

1.Selecttheobjectsnamed:Resistor2.ClicktheOK button

To assign lumped RLC boundary1.Selectthemenuitem HFSS > Boundaries> Assign > Lumped RLC2.LumpedRLCBoundary

1.Name:R,2.Resistance: Checked3.Resistance:47 Ohm4.ForCurrent Flow Line,clickUndefined andselectNew Line5.Usingthecoordinateentryfields,enterthevectorposition

X:1.5mm,Y:0.0,Z:-1.3mm,PresstheEnter key6.Usingthecoordinateentryfields,enterthevertex

dX:0.0,dY:0.0,dZ:1.3mm, PresstheEnter key7.ClicktheOK button


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8.2a

Set Working Coordinate SystemTo set the working coordinate system:

1. SelectthemenuitemModeler > Coordinate System > Set Working CS2. SelectCoordinateSystemWindow,

1. Fromthelist,selecttheCS:Global2. ClicktheSelect button

Create AirTo set the default material as AirUsingthe3DModelerMaterialstoolbar,choosevacuum

To create the air:1. SelectthemenuitemDraw > Box2. Usingthecoordinateentryfields,entertheboxposition

X:-1.5,Y:-1.5,Z:-1.5,PresstheEnter key3. Usingthecoordinateentryfields,entertheoppositecornerofthebase

rectangle:

dX:9.0,dY:13.0,dZ:3.0,PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Air3. ClicktheOK button



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8.2a

Assign a Perfectly Matched Layer (PML)To select the air:

1. SelectthemenuitemEdit > Select > Faces2. SelectthemenuitemEdit > Select by name3. ObjectName:Air

1. FaceID: 2. ClicktheOK button

To assign the PML boundary1. Selectthemenuitem HFSS > Boundaries > PML Setup Wizard2. PMLSetupWizard:CoverObjects

1. Select:Create PML Cover Objects on Selected Faces2. UniformLayerThickness:1cm3. Createjoiningcornerandedgeobjects: Checked4. ClicktheNext button

3. PMLSetupWizard:MaterialParameters

1. Select:PML Objects accept Free Radiation1. MinFrequency: 0.01 GHz2. Radiationdistance: 56.33mm3. ClicktheNext button

2. ReviewsettingsonthePMLSetupWizard:Summarypage.

3. ClicktheFinish button


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8.2a

Create a Face ListSinceweareusingthePML,weneedtocreateafacelistthatwillbeusedforthe

radiationcalculation.

To create a face list1. SelectthemenuitemEdit > Select > Faces2. SelectthemenuitemEdit > Select > By Name3. SelectObjectDialog,

1. Selecttheobjectsnamed:Air2. FaceID: 3. ClicktheOK button

4. SelectthemenuitemMode ler > List > Create > Face List

Create a Radiation Setup1. SelectthemenuitemHFSS > Radiation > Insert Far Field Setup > Infinite

Sphere2. FarFieldRadiationSphereSetupdialog

Infinite Sphere Tab1. Name:Radiation2. Phi:(Start:0, Stop:360, StepSize:10)3. Theta:(Start:-180, Stop:180, StepSize:2)4. ClicktheOK button


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8.2a

Boundary Display1. SelectthemenuitemHFSS > Boundary Display (Solver View)2. FromtheSolverViewofBoundaries,toggletheVisibilitycheckboxforthe

boundariesyouwishtodisplay.

Note: Thebackground(PerfectConductor)isdisplayedastheouterboundary.

Note: ThePerfectConductorsaredisplayedasthesmetal boundary.Note: Selectthemenuitem,View > V isibility tohideallofthegeometryobjects.Thismakesiteasiertoseetheboundary

3. ClicktheClose buttonwhenyouarefinished.


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8.2a

AnalysisSetup

Creating an Analysis SetupTo create an analysis setup:

1. SelectthemenuitemHFSS > Analysis Setup > Add Solution Setup2. SolutionSetupWindow:

1. ClicktheGeneral tab:SolutionFrequency: 2.5GHzMaximumNumberofPasses:20MaximumDeltaS:0.02

2. ClicktheOptions tab:DoLambdaRefinement: CheckedLambdaTarget:UseDefaultValue CheckedOrderofBasisfunction:Zero-OrderClicktheOK button

Adding a Frequency SweepTo add a frequency sweep:

1. SelectthemenuitemHFSS > Analysis Setup > Add Frequency Sweep1. SelectSolutionSetup:Setup12. ClicktheOK button

2. EditSweepWindow:

1. SweepType: Interpolating2. FrequencySetup:

Type: Linear StepStart:0.0GHzStop: 2.5GHzStep: 0.01GHz

3. InterpolatingSweepOptions:

MaxSolutions: 20ErrorTolerance: 0.5%

4. ExtrapolatetoDC: CheckedMinimumSolveFrequency: 0.001 GHz



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8.2a

Save ProjectTo save the project:

1. InanAnsoftHFSSwindow,selectthemenuitemFile > Save As.2. FromtheSave As window,typetheFilename:hfss_seg_gplane3. ClicktheSave button

Analyze

Model ValidationTo validate the model:

1. SelectthemenuitemHFSS > Validation Check2. ClicktheClose button

Note: Toviewanyerrorsorwarningmessages,usetheMessageManager.

AnalyzeTo start the solution process:1. SelectthemenuitemHFSS > Analyze


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8.2a

Solution DataTo view the Solution Data:

1. SelectthemenuitemHFSS > Results > Solution DataTo view the Profile:

1. ClicktheProfile Tab.To view the Convergence:

1. ClicktheConvergence TabNote: ThedefaultviewisforconvergenceisTable.SelectthePlot radiobuttontoviewagraphicalrepresentationsoftheconvergencedata.

To view the Matrix Data:1. ClicktheMatrix Data Tab

Note: Toviewareal-timeupdateoftheMatrixData,settheSimulationtoSetup1, Last Adaptive

2. ClicktheClose button


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8.2a

CreateReports

Create Terminal S-Parameter Plot vs. Adaptive PassNote: Ifthisreportiscreatedpriororduringthesolutionprocess,areal-timeupdateoftheresultsaredisplayed

To create a report:1. SelectthemenuitemHFSS > Results > Create Terminal Solution Data Report

> Rectangular Plot2. ContextWindow:

1. Solution:Setup1: AdaptivePass3. TraceWindow

1. Category:Terminal S Parameters2. Quantity:St(Trace_T1, Trace_T1)3. Function:dB4. ClicktheNew Report button5. ClicktheClose button

1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00Pass

-1.40

-1.30

-1.20

-1.10

-1.00

-0.90

-0.80

-0.70

-0.60

dB(St(Tra

ce

_T1,Trace

_T1))

Ansoft Corporation HFSSDesign1XY Plot 4

Curve Info

dB(St(Trace_T1,Trace_T1))

Setup1 : A daptivePass


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8.2a

Create Z-Parameter Plot Real/Imaginary1. SelectthemenuitemHFSS > Results > Create Terminal Solution Data

Report > Rectangular Plot2. ContextWindow:

1. Solution:Setup1: Sweep12. Domain:Sweep

3. TraceWindow

1. Category:Terminal Z Parameter2. Quantity:Zt(Trace_T1,Trace_T1)3. Function:Re, Im4. ClicktheNew Report button5. ClicktheClose button

4. To add an additional Y-Axisfor im(Z(p1,p1))

1. ClickIm(Z)inProject Manager2. InthePropertieswindow:

SelectY1inYAxiscolumn

andtoggleittoY2

0.00 0.50 1.00 1.50 2.00 2.50Freq [GHz]

0.00

50.00

100.00

150.00

200.00

250.00

300.00

350.00

400.00

450.00

re(Zt(Trace_

T1,Trace_T

1))

-200.00

-150.00

-100.00

-50.00

0.00

50.00

100.00

150.00

200.00

250.00

im(Zt(Trace_

T1,Trace_T

1))


Curve Info

re(Zt(Trace_T1,Trace_T1))

Setup1 : Sweep1

im(Zt(Trace_T1,Trace_T1))

Setup1 : Sweep1


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8.2a

Create Terminal S-Parameter Plot Smith Chart1. SelectthemenuitemHFSS > Results > Create Terminal Solution Data

Report > Smith Chart2. ContextWindow:

1. Solution:Setup1: Sweep13. TraceWindow

1. Category:Terminal S Parameters2. Quantity:St(Trace_T1, Trace_T1)3. Function:4. ClicktheNew Report button5. ClicktheClose button


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8.2a

Matrix Data - Export S-parameters to a fileTo view the Matrix Data:

1. SelectthemenuitemHFSS > Results > Solution Data,2. SolutionDatadialog

1. ClicktheMatrix Data Tab2. Simulation:Setup1, Sweep13. ClicktheExport button.

1.

Filename:hfss_seg_gplane2. SaveasType:Touchstone3. ClicktheSave button4. ClicktheOK buttontoaccept50ohmreferenceimpedance

4. ClicktheClose button


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8.2a

Create 3D Polar Far Field PlotTo create a 3D Far Field Plot

1. SelectthemenuitemHFSS > Results > Create Far Fields Report >3DPolar Plot

2. ContextWindow:

1. Solution:Setup1: LastAdaptive2. Geometry: Radiation

3. TracesWindow:1. Category: rE2. Quantity:rETotal3. Function:dB4. ClicktheNew Report button5. ClicktheClose button


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8.2a

FieldOverlays

Create Field OverlayTo create a field plot:

1. ConfirmyouareinObject Select modebyright-clickinginthegeometrywindow,andselectingfromcontextmenuifnecessary.


1. Selecttheobjectsnamed:Board2. ClicktheOK button

4. SelectthemenuitemHFSS > Fields > Plot Fields > E > Mag_E5. CreateFieldPlotWindow

1. Solution:Setup1 : LastAdaptive2. Quantity:Mag_E3. InVolume:All4. ClicktheDone button

To modify a Magnitude field plot:1. SelectthemenuitemHFSS > Fields > Modify Plot Attributes2. SelectPlotFolderWindow:

1. Select:E Field2. ClicktheOK button

3. E-FieldWindow:

1. ClicktheScale tab1. SelectUse Limits2. Min: 13. Max: 45004. Scale:Log

2. ClickthePlots Tab1. ScalarPlot:IsoValSurface2. ClicktheClose button


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8.2a

Create Field OverlayTo create a field plot:


1. Selecttheobjectsnamed:Ground2. ClicktheOK button

3. SelectthemenuitemHFSS > Fields > Plot Fields > Other >Vector_RealPoynting4. CreateFieldPlotWindow

1. Solution:Setup1 : LastAdaptive2. Quantity:Vector_RealPoynting3. InVolume:All4. ClicktheDone button

To modify the attributes of a field plot:1. SelectthemenuitemHFSS > Fields > Mod ify Plot Attributes2. SelectPlotFolderWindow:

1. Select:Poynting2. ClicktheOK button

3. Poynting Window:

1. ClicktheScale tab1. SelectUse Limits2. Min: 0.013. Max: 25004. Scale:Log

2. ClicktheMarker/Arrow tab,intheArrow Option window1. Type:Cylinder2. MapSize: Unchecked3. ArrowTale: Unchecked4. Ifreal time mode isnotchecked,clicktheApply button.

4. ClicktheClose buttonExiting HFSS

To Exit HFSS:SelectthemenuitemFile > Exit Orclick

1. IfpromptedSavethechanges


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8.2a


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8.2a

Create Z-Parameter Plot Time Domain Response (TDR)1. SelectthemenuitemHFSS > Results > Create Terminal Solution Data

Report > Rectangular Plot2. ContextWindow:

1. Solution:Setup1: Sweep12. Domain:Time

3. ClickTDR Options,OptionsWindowappears:1. InputSignal:Step. Risetime:1ns2. MaximumPlottime:6ns.3. Deltatime:0.1ns4. ClickOK

4. TraceWindow

1. X:Time2. Category:Terminal TDR Impedance3. Quantity:TDRZt(Trace_T1)4. Function:None5.

ClicktheNew Result button6. ClicktheClose button

0.00 1.00 2.00 3.00 4.00 5.00 6.00

Time [ns]

40.00

45.00

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65.00

70.00

TDRZt(Trace_

T1)


Curve Info

TDRZt(Trace_T1)

Setup1 : Sweep1

Documents

08_2_a_hfss_si_segmentedgnd