05 4 Hfss Antenna Slotpatch

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5.4

Example SlotPatch

5.5-1AnsoftHighFrequencyStructureSimulatorv11UsersGuide

TheSlotCoupledPatchAntennaThisexampleisintendedtoshowyouhowtocreate,simulate,andanalyzea

probefeedpatchantennausingtheAnsoftHFSSDesignEnvironment.

Slot(Plane)

Feed(Signal)

Sub2(Dielectric) 0.16cm

Sub1(Dielectric)

Patch(Signal)

0.16cm


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Example SlotPatch


GettingStarted

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

theAnsoft > HFSS 11 programgroup.ClickHFSS 11

Setting Tool OptionsTo set the tool options:

Note: Inordertofollowthestepsoutlinedinthisexample,verifythatthefollowingtooloptionsareset :

1. SelectthemenuitemTools Options HFSS Options2. HFSSOptionsWindow:

1. ClicktheGeneral tabUseWizardsfordatainputwhencreatingnewboundaries: CheckedDuplicateboundarieswithgeometry: Checked

2. ClicktheOK button3. SelectthemenuitemTools Options Modeler Options.4. 3DModelerOptionsWindow:

1. ClicktheOperation tabAutomaticallycoverclosedpolylines: Checked

2. ClicktheDrawing tabEditpropertyofnewprimitives: Checked

3. ClicktheOK button


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Example SlotPatch


Creatingthe3DModel

Set Model UnitsTo set the units:

1. SelectthemenuitemModeler Units2. SetModelUnits:

1. SelectUnits:cm2. ClicktheOK button

Set Default MaterialTo set the default material:

1. Usingthe3DModelerMaterialstoolbar,chooseSelect2. SelectDefinitionWindow:

1. TypeRogers intheSearch by Name fieldandselecttherowforRogers RT/duroid 5880 (tm)2. ClicktheOK button


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Example SlotPatch


Create SubstrateTo create the substrate:

1. SelectthemenuitemDraw Box2. Usingthecoordinateentryfields,entertheboxposition

X:-7.0,Y:-4.5,Z:0.0,PresstheEnter key2. Usingthecoordinateentryfields,entertheoppositecornerofthebox

dX:12.0,dY:9.0,dZ:0.32,PresstheEnter keyTo set the name:

1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Sub13. ChangetheColor toLight Gray4. ChangetheTrasparency to0.65. ClicktheOK button

To fit the view:1. SelectthemenuitemView Fit All Active View. OrpresstheCTRL+D key


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Example SlotPatch


Create the FeedTo create the feed:

1. SelectthemenuitemDraw Rectangle2. Usingthecoordinateentryfields,entertherectangleposition

X:-5.0,Y:-0.2475,Z:0.0,PresstheEnter key3. Usingthecoordinateentryfields,entertheoppositecorneroftherectangle:


1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Feed3. ChangetheColor toBright Blue4. ClicktheOK button

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

Assign a Perfect E boundary to the FeedTo select the feed:

1. SelectthemenuitemEdit Select By Name2. SelectObjectDialog,

1. Selecttheobjectsnamed:Feed2. ClicktheOK button

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

1. Name:PerfE_Feed2. InfiniteGroundPlane: Unchecked3. ClicktheOK button


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Example SlotPatch


Create GroundTo create the ground:




1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Ground3. ChangetheColor toRed4. ChangetheTransparency to0.85. ClicktheOK button


Assign a Perfect E boundary to the GroundTo select the ground:1. SelectthemenuitemEdit Select By Name2. SelectObjectDialog,

1. Selecttheobjectsnamed:Ground2. ClicktheOK button


1. Name:PerfE_Ground2. InfiniteGroundPlane: Unchecked3. ClicktheOK button


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Example SlotPatch


Create Slot Cut OutTo create the cut out:




1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Slot3. ClicktheOK button

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

Complete the GroundTo select the objects ground slot


1. Selecttheobjectsnamed:Ground, Slot2. ClicktheOK button

To perform the boolean subtraction:1. SelectthemenuitemModeler Boolean Subtract2. SubtractWindow

BlankParts:GroundToolParts:SlotClonetoolobjectsbeforesubtract: UncheckedClicktheOK button


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Example SlotPatch


Create PatchTo create the patch:




1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Patch3. ChangetheColor toOrange4. ChangetheTransparency to0.45. ClicktheOK button


Assign a Perfect E boundary to the TraceTo select the patch:1. SelectthemenuitemEdit Select By Name2. SelectObjectDialog,

1. Selecttheobjectsnamed:Patch2. ClicktheOK button


1. Name:PerfE_Patch2. ClicktheOK button


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Example SlotPatch


Set Default MaterialTo set the default material:

1. Usingthe3DModelerMaterialstoolbar,choosevacuumCreate Air

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

X:-7.0,Y:-4.5,Z:-2.0,PresstheEnter key2. Usingthecoordinateentryfields,entertheoppositecornerofthebox


1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Air3. ChangetheColor toBlack4. ChangeDisplay Wireframe to Checked5. ClicktheOK button

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


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Example SlotPatch


Create Radiation BoundaryPicking the faces:

1. SelectthemenuitemEdit Select Faces2. Graphicallyselectall ofthefaces oftheAir objectexcept theface at Z=0.0cm

To create a radiation boundary1. SelectthemenuitemHFSS Boundaries Assign Radiation2. RadiationBoundarywindow

1.

Name:Rad12. ClicktheOK button

Create a Radiation SetupTo define the radiation setup

1. SelectthemenuitemHFSS Radiation Insert Far Field Setup InfiniteSphere

2. FarFieldRadiationSphereSetupdialog

1. SelecttheInfinite Sphere Tab1. Name:ff_2d2. Phi:(Start:0, Stop:90, StepSize:90)3. Theta:(Start:-180, Stop:180, StepSize:2)



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Example SlotPatch


Add Length Based Mesh Operation to the Radiation BoundaryFar fields are calculated by integrating the fields on the radiation surface. Toobtain accurate far fields for antenna problems, the integration surface should beforced to have a /6 to /8 maximum tetrahedra length.To create a length based seed on the radiation boundary:

1. SelecttheAir objectbyleftclickingitinthedrawingwindow2. WhiletheAir objectisselected,movethemousetotheprojecttreeandrightclickonMesh Operations Assign On Selection Length Based

3. Name:LengthOnRadiation4. MaximumLengthofElements:2cm (thisisabout/6 at2.3GHz)5. ClicktheOK button


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Example SlotPatch


Set Grid PlaneTo set the grid plane:

1. SelectthemenuitemMode ler Grid Plane YZ

Create SourceTo create source:

1. SelectthemenuitemDraw Rectangle2. Usingthecoordinateentryfields,entertheboxposition

X:-5.0,Y:-0.2475,Z:0.0,PresstheEnter key3. Usingthecoordinateentryfields,entertheoppositecornerofthebase

rectangle:


1. SelecttheAttribute tabfromtheProperties window.2. FortheValue ofName type:Source3. ChangetheColor toBright Green4. ClicktheOK buttonTo fit the view:1. SelectthemenuitemView Fit All Active View.


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Example SlotPatch


Assign ExcitationTo select the object Source:


1. Selecttheobjectsnamed:Source2. ClicktheOK button

Note:YoucanalsoselecttheobjectfromtheModelTreeTo assign lumped port excitation

1. Selectthemenuitem HFSS Excitations Assign Lumped Port2. PlaceFeed intheConducting Object listandGround intheReferenceConductor list3. ClicktheOK button

Rename the Lumped Port and Terminal1. DoubleclickonLumpPort1 underExcitations intheprojecttree.2. Renametheporttop13. ClicktheOK button4. DoubleclickontheterminalnamedFeed_T15. RenametheterminaltoT16.

ClicktheOK button


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Example SlotPatch


AnalysisSetup

Creating an Analysis SetupTo create an analysis setup:1. SelectthemenuitemHFSS Analysis Setup Add SolutionSetup2. SolutionSetupWindow:

1. ClicktheGeneral tab:SolutionFrequency: 2.25 GHzMaximumNumberofPasses:20MaximumDeltaS:0.02

2. ClicktheOptions tab:EnableIterativeSolver: Checked

3. ClicktheOK buttonAdding a Frequency SweepTo add a frequency sweep:

1. SelectthemenuitemHFSS Analysis Setup Add FrequencySweep1. SelectSolutionSetup:Setup12. ClicktheOK button

2. EditSweepWindow:

1. SweepType: Fast2. FrequencySetupType: Linear Count

Start: 1.0GHzStop: 3.5GHzCount: 201SaveFields: Checked



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Example SlotPatch


Save ProjectTo save the project:

1. InanAnsoftHFSSwindow,selectthemenuitemFile Save As.2. FromtheSave As window,typetheFilename:hfss_slotpatch3. ClicktheSave button

Model ValidationTo validate the model:

1. SelectthemenuitemHFSS Validation Check2. ClicktheClose button

Note: Toviewanyerrorsorwarningmessages,usetheMessageManager.

AnalyzeTo start the solution process:

1. SelectthemenuitemHFSS Analyze All


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Example SlotPatch


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

To view the Mesh Statistics:1. ClicktheMesh Statistics Tab.

2. ClicktheClose button


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Example SlotPatch


CreateReports

Create Terminal S-Parameter Plot - MagnitudeTo create a report:

1. SelectthemenuitemHFSS Results Create Terminal SolutionData Report Rectangular Plot

2. TracesWindow:1. Solution:Setup1: Sweep12. Domain:Sweep3. Category: Terminal S Parameter4. Quantity:St(T1,T1),5. Function:dB6. ClicktheNew Report button7. ClicktheClose button

3. Addaminimummarkertothetrace

1. Selectthetracebyleftclickingonit

2. GotoReport2D Marker Add Minimum


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Example SlotPatch


FarFieldOverlays

Create Far Field OverlayTo create a 2D polar far field plot :

1. SelectthemenuitemHFSS Results Create Far Fields ReportRadiation Pattern

2. TracesWindow:1. Solution:Setup1: Sweep12. Geometry: ff_2d3. IntheFamilies tab,changethefrequencyto2.2875GHz4. IntheTrace tab

1. Category:Gain2. Quantity:GainPhi, GainTheta3. Function:dB

5. ClicktheNew Report button6. ClicktheClose button

05 4 Hfss Antenna Slotpatch

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