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Release 2015.0 May 6, 2015 1 © 2015 ANSYS, Inc.
2015.0 Release
Lecture 3: Antenna Post-Processing
ANSYS HFSS for Antenna Design
Release 2015.0 May 6, 2015 2 © 2015 ANSYS, Inc.
Post Processing Quantities
• Post-Processing allows users to investigate how a device behaves
• There are 3 general types of post-processing in HFSS • Field Data
– Field quantities are derived from the fields solved throughout the solution domain
• MagE, ComplexMagE, VectorE
• MagH, ComplexMagH, VectorH
• MagJsurf, ComplexMagJsurf, VectorJsurf
• Vector_RealPoynting
• Network Data
– S, Y and Z Parameters
– Propagation Constant (ϒ), Port Characteristic Impedance (Zo), Effective Epsilon (ε), Effective Lambda (λ)
• Radiation Data
– Far-Field
– Near-Field
Release 2015.0 May 6, 2015 3 © 2015 ANSYS, Inc.
Post-Processing Formats
• There are 4 formats to view these data • Reports
– Results branch in Project Manager window
• Rectangular Plots
• Polar Plots
• Data Tables
• Smith Charts
• Solution Data
– Select the menu item HFSS > Results > Solution Data...
• Field Overlays
– Field Overlays branch Project Manager window
• Volumetric 3D Field Contours
• Volumetric 2D Field Contours
• Radiation Pattern Overlay
• Antenna Parameters
– Right-click on the Infinite Sphere setup in Radiation branch and select Compute Antenna Parameters...
Release 2015.0 May 6, 2015 4 © 2015 ANSYS, Inc.
Creating Reports
• Report creation can be accessed from 2 different areas of the user interface • Select the menu item HFSS > Results > Create … Report
• From the Project Manager window, right-click on Results and select Create … Report
• Reports are first categorized by the type that will be plotted • Create Modal Solution Data Report
• Create Terminal Solution Data Report
• Create Fields Report
• Create Near Fields Report
• Create Far Fields Report
• Create Emission Test Report
• Reports are then categorized by the Plot Format • Rectangular Plot
• Rectangular Stacked Plot
• Polar Plot
• Data Table
• Smith Chart
• 3D Rectangular Plot
• 3D Polar Plot
• Rectangular Contour Plot
• Smith Contour Plot
Release 2015.0 May 6, 2015 5 © 2015 ANSYS, Inc.
The Report Editor
• The Context Section • Controls which Solution the data is plotted from
• Controls if data is in the Frequency Domain (Sweep) or Time Domain
• The Trace Tab • Selects the Quantity to be plotted
• Selects the independent sweep variable
Selecting the Quantity
Selecting the Sweep Variable
Release 2015.0 May 6, 2015 6 © 2015 ANSYS, Inc.
The Report Editor (Continued …)
• The Families Tab • When solutions exist for multiple variations of the design the Families tab allows users to choose which variation’s data is used
• If multiple variations are selected each one shows up as an additional curve
• The button in the Edit column allows finer control over which variations are included
• Variables can be set to their nominal values to simplify the list
– Nominal values are the current values these variables are set in the design.
Selecting the Nominal Variables
Release 2015.0 May 6, 2015 7 © 2015 ANSYS, Inc.
Create Report
• Create Report • The plot created shows 3 curves for different values of the variable Patch_R
Release 2015.0 May 6, 2015 8 © 2015 ANSYS, Inc.
Field Overlays
• Field Overlays • Field Overlays create contour plots that are applied to geometric surfaces or volumes
• The quantities plotted are directly derived from the volumetric E-Field solution HFSS solves with in the solution domain.
• Creating Field Overlays Plot • Select a surface or volume
• Select the menu item HFSS > Fields > Plot Fields > E > Mag_E
• Or alternatively, from the Project Manager window, right-click on Field Overlays and select Plot Fields > E > Mag_E
Surface is selected
Choose the Field quantity of interest to plot
Release 2015.0 May 6, 2015 9 © 2015 ANSYS, Inc.
Create Field Plots
• The Field Overlays plot definition is controlled through the Create Field Plot window • Context Section
– Controls which solution and frequency the field data is plotted from
– If solutions exist for different variable values HFSS will base the Field Overlays on the nominal values currently defined for the variable.
• Quantity Section
– Allows adjustment of the quantity being plotted
• In Volume Section
– Allows users to restrict the plot to only exist in/on certain objects
Release 2015.0 May 6, 2015 10 © 2015 ANSYS, Inc.
Modify Field Plots
• Modify Field Plot Attributes • Select the menu item HFSS > Fields > Modify Plot Attributes...
– Select the Field quantity plot
– Click the OK button,
– Or alternatively, from the Project Manager window, under Field Overlays. Right-click on the Field quantity and select Modify Attributes...
Release 2015.0 May 6, 2015 11 © 2015 ANSYS, Inc.
Modify Field Plots
• Modify Field Plot Attributes • From the Modify Field Attributes dialog box, click on the Scale tab
– Select the radio button for Log scale
Explore the other tabs in Modify Field Attributes dialog box
Release 2015.0 May 6, 2015 12 © 2015 ANSYS, Inc.
Animate Field Quantity
• Animate Field Quantity • Select the menu item HFSS > Fields > Animate...
– Setup the Animation
• Swept variable: Phase
• Start: 0 deg
• Stop: 170 deg
• Steps: 17
• Click the OK button
Or alternatively, from the Project Manager window,under Field Overlays, Right-click on Field quantity and select Animate...
Release 2015.0 May 6, 2015 13 © 2015 ANSYS, Inc.
Radiation Computations
• Radiation Setup • Radiation Setup allows users to view fields outside of the solution domain.
• Far-Field Infinite Sphere Setup: • Takes the fields solved on an integration surface and predicts the far-field behavior using equivalence and a far-field approximation.
• The default integration surface is defined as the radiation boundary, FEBI boundary, Floquet Port or the surfaces a PML boundary is defined on.
• An Infinite Sphere Setup controls:
– the directions the far-field is calculated in
– the coordinate system used to define the far-field’s spherical coordinates
– the integration surface used for the calculation
• To evaluate the radiated fields in the far-field region, set up an an infinite sphere that surrounds the radiating object
Note: You must have defined at least one radiation or PML boundary in the design for HFSS to compute far-field quantities, regardless of which radiation surfaces you instruct HFSS to use when calculating the far fields. You do not need to re-solve the problem if you modify radiation surfaces in the Far Field Radiation Sphere Setup window.
Release 2015.0 May 6, 2015 14 © 2015 ANSYS, Inc.
Far-Field Infinite Sphere Setup
• Far-Field Setup • Select the menu item HFSS > Radiation > Insert Far Field Setup > Infinite Sphere…
• Or alternatively, from the Project Manager window, right-click on Radiation and select Insert Far Field Setup > Infinite Sphere...
Release 2015.0 May 6, 2015 15 © 2015 ANSYS, Inc.
Compute Antenna Parameters Dialog
• Compute Summary of Far-Field Solutions • From the Project Manager window, Right-click on Infinite Sphere1
– Select Compute Antenna Parameters...
HFSS can also compute antenna parameters, such as the maximum intensity, peak directivity, peak gain, and radiation efficiency
Release 2015.0 May 6, 2015 16 © 2015 ANSYS, Inc.
Radiation Computations Cont.
• Near Field Setup: • Near fields are evaluated at a fixed finite distance from the radiating device.
• A Near Field Setup controls:
– Fields calculated in 3D space
• There are 2 methods for defining the points where the fields are calculated
– Line (Polyline created in the model which extends beyond the solutions domain)
– Sphere
– Coordinate system used to define those points
– Integration surface used for the calculation
• The default integration surface is defined as the radiation boundary, FEBI boundary, or the surfaces a PML are defined on.
Note: You must have defined at least one radiation or PML boundary in the design for HFSS to compute near-field quantities, regardless of which radiation surfaces you instruct HFSS to use when calculating the near fields. You do not need to re-solve the problem if you modify radiation surfaces in the Near Field Radiation Sphere Setup window.
Release 2015.0 May 6, 2015 17 © 2015 ANSYS, Inc.
Near-Field Setup
• Near Field Setup: • Select the menu item HFSS > Radiation > Insert Near Field Setup > Line...
• Or alternatively, from the Project Manager window, right-click on Radiation and select Insert Far Field Setup > Infinite Sphere...
Release 2015.0 May 6, 2015 18 © 2015 ANSYS, Inc.
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