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Chapter 1 - Introduction
Ansoft Antenna/RF Training Guide
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Inventory Number: 002846
4th Edition
HFSS Release: 12.1Designer/Nexxim Release: 5.0.1
Published Date: January 31, 2010
Registered Trademarks:ANSYS is a registered trademark of SAS IP
Inc.
All other product names mentioned in this manual are trademarks
or registered trademarks of their respective manufacturers.
Disclaimer Notice:This document has been reviewed and approved
in accordance with the ANSYS, Inc. Documentation Review and
Approval Procedures. This ANSYS Inc. software product (the Program)
and program documentation (Documentation) are furnished by ANSYS,
Inc. under an ANSYS Software License Agreement that contains
provisions concerning non-disclosure, copying, length and nature of
use, warranties, disclaimers and remedies, and other provisions.
The Program and Documentation may be used or copied only in
accordance with the terms of that License Agreement.
Copyright 2008 SAS IP, Inc.
Proprietary data. Unauthorized use, distribution, or duplication
is prohibited.
All Rights Reserved.
Training Manual
Ansoft HFSS for Antenna/RF User Guide
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Table of Contents
Lectures
1. Introduction
2. Simulation Overview
3. Boundary Conditions
4. Mesh Operations/Advanced Solver Settings
5. Phased Array Design
6. Antenna Post Processing
7. Complex Geometry Modeling
8. An Introduction to Optimetrics
9. Field Calculator
10. Radar Cross Section (RCS)
11. An Introduction to HFSS-IE
Workshops
1. Examples Phased Array
HFSS: Waveguide Array 1-1
2. Examples Optimetrics
HFSS: Shorted Patch 2-1
Ansoft Designer: Dual-Band WLAN Antenna 2-2
3. Examples Push Excitations
Ansoft Designer: Active Antenna Array 3-1
4. Examples RCS
HFSS: RCS of a PEC Cube 4-1
5. Examples HFSS-IE
HFSS-IE: RCS of a PEC Cube 5-1
HFSS-IE: Reflector (HFSS DataLink) 5-2
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Welcome to Ansoft HFSS
What is HFSS? HFSS is a high-performance full-wave
electromagnetic(EM) field simulator for arbitrary 3D volumetric
passive device
modeling that takes advantage of the familiar Microsoft Windows
graphical user interface. It integrates simulation,
visualization, solid modeling, and automation in an
easy-to-learn environment where solutions to your 3D EM
problems
are quickly and accurately obtained. Ansoft HFSS employs the
Finite Element Method (FEM), adaptive meshing, and
brilliant graphics to give you unparalleled performance and
insight to all of your 3D EM problems. Ansoft HFSS can be
used to calculate parameters such as S-Parameters, Resonant
Frequency, and Fields. Typical uses include:
Antennas/Mobile Communications Patches, Dipoles, Horns,
Conformal Cell Phone Antennas, Quadrafilar Helix, Specific
Absorption Rate (SAR), Infinite Arrays, Radar Cross Section (RCS),
Frequency Selective Surfaces (FSS)
Waveguide Filters, Resonators, Transitions, Couplers
Filters Cavity Filters, Microstrip, Dielectric Package Modeling
BGA, QFP, Flip-Chip
EMC/EMI Shield Enclosures, Coupling, Near- or Far-Field
Radiation
PCB Board Modeling Power/Ground planes, Mesh Grid Grounds,
Backplanes
Silicon/GaAs - Spiral Inductors, Transformers
Connectors Coax, SFP/XFP, Backplane, Transitions
HFSS is an interactive simulation system whose basic mesh
element is a tetrahedron. This allows you to solve any
arbitrary 3D geometry, especially those with complex curves and
shapes, in a fraction of the time it would take using
other techniques.
The name HFSS stands for High Frequency Structure Simulator.
Ansoft pioneered the use of the Finite Element
Method (FEM) for EM simulation by developing/implementing
technologies such as tangential vector finite elements,
adaptive meshing, and Adaptive Lanczos-Pade Sweep (ALPS). Today,
HFSS continues to lead the industry with
innovations such as Modes-to-Nodes and Full-Wave Spice.
Ansoft HFSS has evolved over a period of years with input from
many users and industries. In industry, Ansoft HFSS
is the tool of choice for high-productivity research,
development, and virtual prototyping.
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Installing the Ansoft HFSS software
System Requirements For up-to-date information, refer to the
HFSS Installation Guide
Installing the Ansoft HFSS Software For up-to-date information,
refer to the HFSS Installation Guide
Starting Ansoft HFSS Click the Microsoft Start button, select
Programs, and select the Ansoft, HFSS 12 program group. Click HFSS
12.
Or Double click on the HFSS 12 icon on the Windows Desktop
NOTE: You should make backup copies of all HFSS projects created
with a
previous version of the software before opening them in HFSS
12
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Web Update
WebUpdate This feature allows you to update any existing Ansoft
software from the WebUpdate window. This feature automatically
scans your system to find any Ansoft software, and then allows
you to download any updates if they are available.
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Getting Help
Getting Help If you have any questions while you are using
Ansoft HFSS you can find answers in several ways:
Ansoft HFSS Online Help provides assistance while you are
working.
To get help about a specific, active dialog box, click the Help
button in the dialog box or press the F1 key.
Select the menu item Help > Contents to access the online
help system.
Tooltips are available to provide information about tools on the
toolbars or dialog boxes. When you hold the
pointer over a tool for a brief time, a tooltip appears to
display the name of the tool.
As you move the pointer over a tool or click a menu item, the
Status Bar at the bottom of the Ansoft HFSS
window provides a brief description of the function of the tool
or menu item.
The Ansoft HFSS Getting Started guide provides detailed
information about using HFSS to create and solve
3D EM projects.
Ansoft Technical Support
To contact Ansoft technical support staff in your geographical
area, please log on to the Ansoft corporate
website, www.ansoft.com and select Contact.
Your Ansoft sales engineer may also be contacted in order to
obtain this information.
Visiting the Ansoft Web Site If your computer is connected to
the Internet, you can visit the Ansoft Web site to learn more about
the Ansoft company
and products.
From the Ansoft Desktop
Select the menu item Help > Ansoft Corporate Website to
access the Online Technical Support (OTS)
system.
From your Internet browser
Visit www.ansoft.com
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Technical Support
For Technical Support The following link will direct you to the
Ansoft Support Page. The Ansoft Support Pages provide
additional
documentation, training, and application notes. Web Site:
http://www.ansoft.com/support.cfm
University Support Email Support: [email protected]
North America Commercial Support Email Support:
[email protected]
The names and numbers in this list may change without notice
Technical Support:
9-4 EST:
Pittsburgh, PA
(412) 261-3200 x199
Burlington, MA
(781) 229-8900 x199
9-4 PST:
San Jose, CA
(408) 261-9095 x199
Irvine, CA
(714) 417-9311 x199
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Ansoft Desktop Terms
Ansoft Desktop Terms The Ansoft HFSS Desktop has several
optional panels:
A Project Manager which contains a design tree which lists the
structure of the project.
A Message Manager that allows you to view any errors or warnings
that occur before you begin a simulation.
A Property Window that displays and allows you to change model
parameters or attributes.
A Progress Window that displays solution progress.
A 3D Modeler Window which contains the model and model tree for
the active design.
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Ansoft HFSS Desktop
Menu
bar
Progress
Window
Property Window
Message
Manager
Project
Manager
with project
tree
Status
bar
3D Modeler
Window
Toolbars
Coordinate Entry Fields
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Ansoft Desktop Terms
Project Manager
Project
Design
Design Results
Design Setup
Design AutomationParametric
OptimizationSensitivityStatistical
Project Manager Window
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Ansoft Desktop Terms
Property Window
Property Window
Property tabs
Property
buttonsProperty
table
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Ansoft Desktop Terms
Ansoft 3D Modeler
EdgeVertex
Plane
Coordinate System (CS)
Origin
Face
Model
3D Modeler Window
Graphics
area
Model
3D Modeler
design tree
Context menu
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Ansoft Desktop Terms
3D Modeler Design Tree
Grouped by Material
Object View
Material
Object
Object Command
History
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Design Windows
Design Windows In the Ansoft HFSS Desktop, each project can have
multiple designs and each design is displayed in a separate
window.
You can have multiple projects and design windows open at the
same time. Also, you can have multiple views of the
same design visible at the same time.
To arrange the windows, you can drag them by the title bar, and
resize them by dragging a corner or border. Also, you
can select one of the following menu options: Window
>Cascade, Window >Tile Vertically, or Window > Tile
Horizontally.
To organize your Ansoft HFSS window, you can iconize open
designs. Click the Iconize ** symbol in the upper right
corner of the document border. An icon appears in the lower part
of the Ansoft HFSS window. If the icon is not visible,
it may be behind another open document. Resize any open
documents as necessary. Select the menu item Window
> Arrange Icons to arrange them at the bottom of the Ansoft
HFSS window.
Select the menu item Window > Close All to close all open
design. You are prompted to Save unsaved designs.
Design icons
Iconize
Symbol
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Toolbars
Toolbars The toolbar buttons are shortcuts for frequently used
commands. Most of the available toolbars are displayed in this
illustration of the Ansoft HFSS initial screen, but your Ansoft
HFSS window probably will not be arranged this way. You
can customize your toolbar display in a way that is convenient
for you.
Some toolbars are always displayed; other toolbars display
automatically when you select a document of the related
type. For example, when you select a 2D report from the project
tree, the 2D report toolbar displays.
To display or hide individual toolbars: Right-click the Ansoft
HFSS window frame.
A list of all the toolbars is displayed. The toolbars with a
check mark beside them are visible; the toolbars without a check
mark are hidden. Click the toolbar name to turn its display on or
off
To make changes to the toolbars, select the menu item Tools >
Customize. See Customize and Arrange Toolbars on
the next page.
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Toolbars
Customize and Arrange Toolbars Select the menu item Tools >
Customize, or right-click the Ansoft HFSS window frame and click
Customize at the
bottom of the toolbar list.
In the Customize dialog, you can do the following:
View a Description of the toolbar commands
Select an item from the Component pull-down list
Select an item from the Category list
Using the mouse click on the Buttons to display the
Description
Click the Close button when you are finished
Toggle the visibility of toolbars
From the Toolbar list, toggle the check boxes to control the
visibility of the toolbars
Click the Close button when you are finished
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Overview
Ansoft HFSS Desktop The Ansoft HFSS Desktop provides an
intuitive, easy-to-use interface for developing passive RF device
models.
Creating designs, involves the following:
Parametric Model Generation creating the geometry, boundaries
and excitations
Analysis Setup defining solution setup and frequency sweeps
Results creating 2D/3D reports and field plots
Solve Loop - the solution process is fully automated
To understand how these processes co-exist, examine the
illustration shown on the next page.
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Overview
Design
Solution Type
Boundaries
Excitations
Mesh
OperationsAnalysis
Solution Setup
Frequency Sweep
Parametric ModelGeometry/Materials
Results2D Reports
Fields
Mesh
RefinementSolve
Update
Converged
Analyze
Finished
Solve Loop
NO
YES
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Opening a Design
Opening a HFSS project Opening a New project
In an Ansoft HFSS window, select the menu item File >
New.
Select the menu Project > Insert HFSS Design.
Opening an Existing HFSS project
In an Ansoft HFSS window, select the menu File > Open.
Use the Open dialog to select the project.
Click Open to open the project
Opening an Existing Project from Explorer
You can open a project directly from the Microsoft Windows
Explorer.
To open a project from Windows Explorer, do one of the
following:
Double-click on the name of the project in Windows Explorer.
Right-click the name of the project in Windows Explorer and
select Open from the shortcut menu.
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Set Solution Type
Set Solution Type This section describes how to set the Solution
Type. The Solution Type defines the type of results, how the
excitations
are defined, and the convergence. The following Solution Types
are available:
Driven Modal - calculates the modal-based S-parameters. The
S-matrix solutions will be expressed in terms of the incident and
reflected powers of waveguide modes.
Driven Terminal - calculates the terminal-based S-parameters of
multi-conductor transmission line ports. The S-matrix solutions
will be expressed in terms of terminal voltages and currents.
Eignemode calculate the eigenmodes, or resonances, of a
structure. The Eigenmode solver finds the resonant frequencies of
the structure and the fields at those resonant frequencies.
Convergence
Driven Modal Delta S for modal S-Parameters. This was the only
convergence method available for Driven Solutions in previous
versions.
Driven Terminal Delta S for the single-ended or differential
nodal S-Parameters.
Eigenmode - Delta F
To set the solution type:
Select the menu item HFSS > Solution Type
Choose one of the following:
Driven Modal
Driven Terminal
Eigenmode
Click the OK button
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Converting older files
Converting Older HFSS file to HFSS 12 Because of changes to the
HFSS files with the development of HFSS 12, opening a HFSS project
from an earlier
release may take more time than you are used to experiencing.
However, once the file has been opened and saved,
subsequent opening time will return to normal
Ansoft HFSS 12 provides a way for you to automatically convert
your HFSS projects from an earlier version to the
HFSS 12 format.
To access HFSS projects in an earlier version.
Select the menu item File > Open
Files of Type: Ansoft HFSS Project Files (.hfss)
Browse to the existing project and select the .hfss file
Click the Open button
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Chapter 2 Simulation Basics
Ansoft Antenna/RF Training Guide
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Core Technology
HFSS High Frequency Structure Simulator
Arbitrary 3D Volumetric Full-Wave Field Solver
Ansoft Desktop
Advanced ACIS based Modeling
True Parametric Technology Dynamic Editing
Powerful Report Generation
Dynamic Field Visualization
Design Flow Automation
Optimetrics/Ansoft Designer/AnsoftLinks
Advanced Material Types
Frequency Dependent Materials
Non-linear Materials
Anisotropic Materials
Advanced Boundary Conditions
Radiation and Perfectly Matched Layers
Symmetry, Finite Conductivity, Infinite Planes, RLC, and Layered
Impedance
Master/Slave Unit Cells
Advanced Solver Technology
Automatic Conformal Mesh Generation
Adaptive Mesh Generation
Internal/External Excitations Includes Loss
ALPS Fast Frequency Sweep
Eigenmode
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Common HFSS Applications
Antenna
Planar Antennas - Patches, Dipoles, Horns, Conformal Cell Phone
Antennas, Spirals
Waveguide Circular/Square Horns
Wire Dipole, Helix
Arrays - Infinite Arrays, Frequency Selective Surfaces (FSS)
& Photonic Band Gaps (PBG)
Radar Cross Section (RCS)
Microwave
Filters Cavity Filters, Microstrip, Dielectric
EMC/EMI Shield Enclosures, Coupling, Near- or Far-Field
Radiation
Connectors Coax, SFP/XFP, Backplane, Transitions
Waveguide Filters, Resonators, Transitions, Couplers
Silicon/GaSa - Spiral Inductors, Transformers
Signal Integrity/High-Speed Digital
Package Modeling BGA, QFP, Flip-Chip
PCB Board Modeling Power/Ground planes, Mesh Grid Grounds,
Backplanes
Connectors SFP/XFP, VHDM, GBX, NexLev, Coax
Transitions Differential/Single-ended Vias
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HFSS - Results
Matrix Data Modal/Terminal/Differential
S-, Y-, and Z-Parameters
VSWR
Excitations
Complex Propagation Constant (Gamma)
Zo
Full-Wave Spice
Full-Wave Spice Broadband Model
Lumped RLC Low Frequency Model
Partial Fraction - Matlab
Export Formats HSPICE, PSPICE, Cadence Spectre, and Maxwell
SPICE
Common Display Formats:
Rectangular, Polar
Smith Chart
Data Tables
Common Output Formats:
Neutral Models Files (NMF) (Optimetrics only)
Parametric Results
Touchstone, Data Tables, Matlab, Citifile
Graphics Windows Clipboard
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HFSS - Results
Fields Modal/Terminal/Differential
Electric Field
Magnetic Field
Current (Volume/Surface)
Power
Specific Absorption Rate
Radiation
2D/3D Far-/Near-Fields
Arrays Regular and Custom Setups
RCS
Field Calculator
User Defined Field Calculations
Common Display Formats
Volume
Surface
Vector
2D Reports Rectangular, Polar, Radiation Patterns
Common Output Formats:
Animations AVI, GIF
Data Tables
Graphics Windows Clipboard, BMP, GIF, JPG, TIFF, VRML
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What is HFSS (High Frequency Structure Simulator)? HFSS is the
industry-standard software for S-parameter, full-wave SPICE
extraction and
electromagnetic simulation of high-frequency and high-speed
components. HFSS is widely used for
the design of on-chip embedded passives, PCB interconnects,
antennas, RF/microwave components,
and high-frequency IC packages.
HFSS improves engineering productivity, reduces development
time, and better assures first-pass design success. The latest
release of HFSS delivers significant productivity gains to
Microwave/RF
engineers and expands electromagnetic co-design to a new segment
of engineers working in the
areas of RF/analog IC and multi-gigabit designs as well as
EMI/EMC.
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HFSS Methodology
HFSS uses the Finite Element Method (FEM) to solve Maxwells
equations. The primary advantage of the FEM for solving partial
differential equations lies in the ability of the basic building
blocks
used to discretize the model to confrom to arbitrary
geometry.
The arbitrary shape of the basic building block (tetrahedron)
also allows HFSS to generate a coarse mesh where fewer
cells are needed to yield an accuate solution, while creating a
finely discretized mesh where the field is rapidly varying
or higher accuaracy is needed to obtain an accurate global
solution.
The FEM has been a standard for solving electromagnetic problems
since the inception of HFSS in 1990.
The FEM has been a standard for solving problems in structure
mechanics since the mid 1950s.
Tetrahedron
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HFSS - Technology
Tangential Vector Finite Elements
Transfinite Element Method
Adaptive Meshing
Vertex: Explicitly
Solved
Edge: Explicitly
Solved
Face:
Interpolated
Initial Converged
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Create Initial
Mesh
Solve fields using the
Finite Element Method
Max(|DS|)
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1D FEM Example
1D FEM Example The finite element method (FEM) can be used to
approximate the unknown curve F(x).
The model is first discretized into cells (1, 2, 5).
Each cell is sampled to create a polynomial basis function which
describes the function along the entire line.
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1D FEM Example
The finite element method (FEM) can be used to approximate the
unknown curve F(x).
The basis functions try to describe the fields in between the
sampled points.
A key feature of the FEM, as it is implemented in HFSS, is the
ability to locally determine the error.
Recall that F(x) is not known, but the ERROR can be
determined1
1 D. K. Sun, Z. Cendes, J.-Fa Lee, Adaptive Mesh Refinement,
h-Version, for Solving Multiport Microwave Devices in Three
Dimensions, IEEE Trans Magnetics, pp 1596-1599, Vol. 36, N.4, July
2000
Error
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The finite element method (FEM) can be used to approximate the
unknown curve F(x). One method of decreasing the error is to make
the mesh denser in areas of high error.
The FEM, with tetrahedral elements, allows for local control of
the mesh density so a uniform mesh is not required.
1D FEM Example
Cell 1 Is Divided to
Reduce the Error
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The key to success
Finite elements and adaptive meshing Geometrically conforming,
tetrahedral mesh automatically generated and refined below a user
defined electrical length.
Iterative algorithm solves the fields of the model and
intelligently refines the mesh until S-parameters converge below
a
user defined threshold, Max Delta S.
User defines frequency or frequencies at which adaptive meshing
is performed.
After each solution tetrahedral elements are graded for their
accuracy to Maxwell's Equations.
User defines percentage of bad tetrahedral elements to be
refined after each pass (30% Default).
Vertex: Explicitly Solved
Edge: Explicitly Solved
Face: Interpolated
Geometrically conforming,
tetrahedral mesh
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The Solve
HFSS Automated solution process
Initial Mesh RefinementAdaptive Port
Refinement
Solve
Quantify Mesh
Accuracy
Mesh Refinement
Frequency Sweep
Yes
No
Max(|DS|)
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Example Circular Waveguide Horn HFSS High Frequency Structure
Simulator Full-Wave 3D field solver
Solves for the fields in an arbitrary volume
Waveguide Plug
Radome
Dielectric Waveguide
Circular Waveguide Horn Example
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HFSS Start to Finish
The ProcessDesign
Solution Type
Boundaries
Excitations
Mesh
OperationsAnalysis
Solution Setup
Frequency Sweep
Parametric ModelGeometry/Materials
Results2D Reports
Fields
Mesh
RefinementSolve
Update
Converged
Analyze
Finished
Solve Loop
NO
YES
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An Introduction to HFSS
Getting Started
Launching Ansoft HFSS To access Ansoft HFSS, click the Microsoft
Start button, select Programs, and select the Ansoft, HFSS 12
program
group. Click HFSS 12.
Setting Tool Options Note: In order to follow the steps outlined
in this example, verify that the following tool options are set
:
Select the menu item Tools > Options > HFSS Options
Click the General tab
Use Wizards for data input when creating new boundaries:
Checked
Duplicate boundaries with geometry: Checked
Click the OK button
Select the menu item Tools > Options > Modeler
Options.
Click the Operation tab
Automatically cover closed polylines: Checked
Select last command on object select: Checked
Click the Drawing tab
Edit property of new primitives: Checked
Click the OK button
Opening a New Project If a new project and new design are not
already opened, then:
In HFSS Desktop, click the On the Standard toolbar, or select
the menu item File > New.
From the Project menu, select Insert HFSS Design.
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Ansoft Desktop
Menu
bar
Progress
Window
Property
Window
Message
Manager
Project
Manager
with project
tree
Status
bar
3D Modeler
Window
Toolbars
Coordinate Entry Fields
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Project Manager
Ansoft Desktop Project Manager
Multiple Designs per Project
Multiple Projects per Desktop
Integrated Optimetrics Setup
Requires License for Analysis
Project
Design
Design Results
Design Setup
Design
AutomationParametricOptimizationSensitivityStatistical
Project Manager Window
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3D Modeler
EdgeVertex
Plane
Coordinate System (CS)
Origin
Face
Model
Modeler WindowGraphics
area Model
Modeler
design tree
Context menu
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Solution Type
Set Solution Type Select the menu item HFSS > Solution
Type
Choose Driven Modal
Click the OK button
HFSS - Solution Types Driven Modal - calculates the modal-based
S-parameters. The S-matrix solutions will be expressed in terms of
the
incident and reflected powers of waveguide modes.
Generalized S-parameters
Driven Terminal - calculates the terminal-based S-parameters of
multi-conductor transmission line ports. The S-matrix
solutions will be expressed in terms of terminal voltages and
currents.
Eigenmode calculate the eigenmodes, or resonances, of a
structure. The Eigenmode solver finds the resonant frequencies of
the structure and the fields at those resonant frequencies.
Convergence
Driven Modal Delta S for modal S-Parameters.
Driven Terminal Delta S for the single-ended or differential
nodal S-Parameters.
Eigenmode - Delta F
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Unit and Material Setup
Set Model Units Select the menu item Modeler > Units
Select Units: mil
Click the OK button
Set Default Material Using the 3D Modeler Materials toolbar,
choose Select
From the Select Definition window, click the Add Material
button
For the Material Name type: WGPlug
For the Value of Relative Permittivity type: 1.9
Click the OK button
Click the OK button
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3D Modeler Create a Primitive
The Coordinate Entry fields allow equations to be entered for
position values.
Examples: 2*5, 2+6+8, 2*cos(10*(pi/180)).
Variables are not allowed in the Coordinate Entry Field
Note: Trig functions are in radians
Point 2
Point 3
Point 1
Grid Plane
Base Rectangle
Point 1
Point 2
Point 3
Coordinate Entry Fields
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3D Modeler Object Properties
Attributes
Commands
Attributes
Commands
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3D Modeler - Attributes
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Set Grid Plane Select the menu item Modeler > Grid Plane >
XY
Create Waveguide Plug Select the menu item Draw >
Cylinder
Using the coordinate entry fields, enter the center position
X: 0.0, Y: 0.0, Z: 0.0, Press the Enter key
Using the coordinate entry fields, enter the radius of the
cylinder
dX: 284.0, dY: 0.0, dZ: 0.0, Press the Enter key
Using the coordinate entry fields, enter the height of the
cylinder
dX: 0.0, dY: 0.0 dZ: -250.0, Press the Enter key
Select the Attribute tab from the Properties window.
For the Value of Name type: WG_Plug
Click the OK button
Select the menu item View > Fit All > Active View. Or
press the CTRL+D key
Create Waveguide Plug
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Modeler - Views View > Modify Attributes >
Orientation Predefined/Custom View Angles
Lighting Control angle, intensity, and color of light
Projection Control camera and perspective
Background Color Control color of 3D Modeler background
View > Active View Visibility - Controls the display of: 3D
Modeler
Objects, Color Keys, Boundaries, Excitations, Field Plots
View > Options Stereo Mode, Drag Optimization, Color Key
Defaults,Default Rotation
View > Render > Wire Frame or Smooth Shaded (Default)
View > Coordinate System > Hide or Small (Large)
View > Grid Setting Controls the grid display
Toolbar: Toggle Grid Visibility
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Changing the View
Context Menu
Shortcuts
Since changing the view is a frequently used operation, some
useful shortcut keys exist. Press the appropriate keys and drag the
mouse with the left button pressed:
ALT + Drag Rotate
In addition, there are 9 pre-defined view angles that can be
selected by holding the ALT key and double clicking on the
locations shown on the next page.
Shift + Drag - Pan
ALT + Shift + Drag Dynamic Zoom
Pan
Rotate Around
Model Center
Dynamic Zoom
Zoom In/Out
Top
Bottom
Right
Predefined View Angles
Left
Rotate Around
Current Axis
Rotate Around
Screen Center
Fit All
Fit Selected
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Set Default Material Using the 3D Modeler Materials toolbar,
choose Select
From the Select Definition window, click the Add Material
button
For the Material Name type: WG
For the Value of Relative Permittivity type: 2.1
Click the OK button
Click the OK button
Create Waveguide Select the menu item Draw > Cylinder
Using the coordinate entry fields, enter the center position
X: 0.0, Y: 0.0, Z: -250.0, Press the Enter key
Using the coordinate entry fields, enter the radius of the
cylinder
dX: 284.0, dY: 0.0, dZ: 0.0, Press the Enter key
Using the coordinate entry fields, enter the height of the
cylinder
dX: 0.0, dY: 0.0 dZ: -740.0, Press the Enter key
Select the Attribute tab from the Properties window.
For the Value of Name type: WG
Click the OK button
To fit the view:
Select the menu item View > Fit All > Active View
Create Waveguide
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Port Setup
Create Excitation Select the menu item Edit > Select >
Faces
By moving the mouse, graphically highlight the bottom face of
the WG object
Click the left mouse button to select the face (use the B key to
select Next Behind)
Select the menu item HFSS > Excitations > Assign > Wave
Port
Wave Port : General
Name: p1,
Click the Next button
Wave Port : Modes
Number of Modes: 2,
For mode 1, click the None column and select New Line
Using the coordinate entry fields, enter the vector position
X: 284.0, Y: 0.0, Z: -990.0, Press the Enter key
Using the coordinate entry fields, enter the vertex
dX: -568.0, dY: 0.0, dZ: 0.0, Press the Enter key
For mode 2, click the None column and select New Line
Using the coordinate entry fields, enter the vector position
X: 0.0, Y: 284.0, Z: -990.0, Press the Enter key
Using the coordinate entry fields, enter the vertex
dX: 0.0, dY: -568.0, dZ: 0.0, Press the Enter key
Select Align modes using integration lines
Click the Next button
Click the Finish button
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Set Default Material Using the 3D Modeler Materials toolbar,
choose Select
Type aluminum in the Search by Name field
Click the OK button
Create Waveguide Body Select the menu item Draw >
Cylinder
Using the coordinate entry fields, enter the center position
X: 0.0, Y: 0.0, Z: 0.0, Press the Enter key
Using the coordinate entry fields, enter the radius of the
cylinder
dX: 290.0, dY: 0.0, dZ: 0.0, Press the Enter key
Using the coordinate entry fields, enter the height of the
cylinder
dX: 0.0, dY: 0.0 dZ: -996.0, Press the Enter key
Select the Attribute tab from the Properties window.
For the Value of Name type: WG_Body
Select the menu item Edit > Select > Objects
Select the menu item Edit > Select > By Name
Select the objects named: WG_Body, WG_Plug, WG
Click the OK button
Select the menu item Modeler > Boolean > Subtract
Blank Parts: WG_Body
Tool Parts: WG_Plug, WG
Clone tool objects before subtract: Checked
Click the OK button
Create Waveguide Body
The resulting object should look like a cup
Note: The visibility of the WG_Plug and
WG have been turned off to show the
resulting WG_Body object after the
subtraction.
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Set Default Material Using the 3D Modeler Materials toolbar,
choose Select
From the Select Definition window, click the Add Material
button
For the Material Name type: Radome
For the Value of Relative Permittivity type: 4.1
Click the OK button
Click the OK button
Create Radome Select the menu item Draw > Box
Using the coordinate entry fields, enter the Position
X: -550.0, Y: -550.0, Z: 0.0 Press the Enter key
Using the coordinate entry fields, enter the opposite corner of
the base rectangle
dX: 1100.0, dY: 1100.0, dZ: 23.0, Press the Enter key
Select the Attribute tab from the Properties window.
For the Value of Name type: Radome
Click the OK button
Select the menu item View > Fit All > Active View
Create Radome
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Create Air Box
Set Default Material Using the 3D Modeler Materials toolbar,
choose vacuum
Create Air box Select the menu item Draw > Box
Using the coordinate entry fields, enter the Position
X: -600.0, Y: -600.0, Z: -1050.0 Press the Enter key
Using the coordinate entry fields, enter the opposite corner of
the base rectangle
dX: 1200.0, dY: 1200.0, dZ: 1225.0, Press the Enter key
Select the Attribute tab from the Properties window.
For the Value of Name type: Air
Click the OK button
Select the menu item View > Fit All > Active View
Air Box
Approx. /8
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Boundary Setup
Select the faces of the Air object Select the menu item Edit
> Select > By Name
Select the objects named: Air
Click the OK button
Select the menu item Edit > Select > All Object Faces
Add Perfectly Matched Layer (PML) Select the menu item HFSS >
Boundaries > PML Setup Wizard
PML Setup Wizard: Cover Objects.
Uniform Layer Thickness: 600mil (Approx. /2)
Click the Next button
PML Setup Wizard: Material Properties.
Minimum Frequency: 9GHz
Minimum Radiating Distance: 150mil
Click the Next button
PML Setup Wizard: Summary
Show Objects in Groups: Checked
Click the Finish button
Create a Radiation Setup Select the menu item HFSS >
Radiation > Insert Far Field Setup > Infinite Sphere
Name: ff_2d
Phi: (Start: 0, Stop: 90, Step Size: 90)
Theta: (Start: -180, Stop: 180, Step Size: 2)
Click the OK button
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Creating an Analysis Setup Select the menu item HFSS >
Analysis Setup > Add Solution Setup
Click the General tab:
Solution Frequency: 10.8 GHz
Maximum Number of Passes: 20
Click the Options tab:
Order of Basis Functions: Second Order
Enable Iterative Solver: Checked
Click the OK button
Analysis Setup
Adapt Frequency
Add Solution Setup
Basis Order
Iterative Solver
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Adding a Frequency Sweep Select the menu item HFSS > Analysis
Setup > Add Sweep
Select Solution Setup: Setup1
Click the OK button
Edit Sweep Window:
Sweep Type: Discrete
Frequency Setup Type: Linear Step
Start: 10.2 GHz
Stop: 10.8 GHz
Step: 0.1 GHz
Save Fields: Checked
Click the OK button
HFSS Frequency Sweep Discrete Solves using adaptive mesh at
every frequency
Matrix Data and Fields at every frequency in sweep
Fast - ALPS
Matrix Data and Fields at every frequency in sweep
Interpolating Adaptively determines discrete solve points using
the adaptive mesh
Matrix Data at every frequency in sweeps
Fields at last adaptive solution
Add Sweep
Analysis Setup
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Analyze
Save Project Select the menu item File > Save As
Filename: hfss_wg_ant
Click the Save button
Model Validation Select the menu item HFSS > Validation
Check
Click the Close button
Note: To view any errors or warning messages, use the Message
Manager.
Analyze Select the menu item HFSS > Analyze All
Validate Analyze All
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Post Processing
Create Reports Select the menu item HFSS > Results >
Create Modal Solution Data Report> Rectangular Plot
Solution: Setup1: Sweep1
Domain: Sweep
Category: Modal S Parameter
Quantity: S(p1:1, p1:1), S(p1:1,p1:2), S(p1:2,p1:2) Note: Hold
Ctrl key to select multiple traces
Function: dB
Click New Report button
Click Close button
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Set Mode Field Excitation Select the menu item HFSS > Fields
> Edit Sources
Edit Sources Window:
For p1:1: Scaling Factor: 1, Offset Phase: 0 deg
For p1:2: Scaling Factor: 1, Offset Phase: 90 deg
Click the OK button
Note: The Edit Sources only impacts the field display
and data based on the fields (Far/Near Field). The
default for a Driven Modal solution is to excite Port 1
Mode 1 with 1W. The remaining modal ports are
perfectly matched. For a Driven Terminal solution, Port 1
terminal 1 is excited with 1V. The remaining terminals
are opens. In a terminal setup the user can also control
the load at each terminal.
Post Processing
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Create Field Overlay From the 3D Model tree, expand the
Planes
From the tree, select the Global YZ
Select the menu item HFSS > Fields > Plot Fields > E
> Mag_E
Solution: Setup1 : LastAdaptive
Quantity: Mag_E
Click the Done button
Select the menu item HFSS > Fields > Modify Plot
Attributes
Select Plot Folder Window, Click the OK button
E-Field Window:
Click the Scale tab
Scale: Log
If real time mode is not checked, click the Apply button.
Click the Close button
To Animate the field plot:
Select the menu item HFSS > Fields> Animate
Click the OK button
Post Processing
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Create Reports Select the menu item HFSS > Results >
Create Far Fields Report> Radiation Pattern
New Report Window:
Solution: Setup1: Last Adaptive
Geometry: ff_2d
Category: Realized Gain
Quantity: RealizedGainLHCP, RealizedGainRHCP, Note: Hold Ctrl
key to select multiple traces
Function: dB
Click New Report button
Click Close button
Post Processing
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Mesh
GUI
Solver
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Preview in File Open dialog New
User Definable Keyboard Shortcuts New
Define, load or save shortcut keys to common commands
Desktop Enhancements
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Modeler Primitives 2D Draw Objects
The following 2D Draw objects are available:
Line, Spline, Arc, Equation Based Curve,
Rectangle, Ellipse, Circle, Regular Polygon,
Equation Based Surface
3D Draw Objects
The following 3D Draw objects are available:
Box, Cylinder, Regular Polyhedron, Cone,
Sphere, Torus, Helix, Spiral, Bond Wire
Toolbar: 2D Objects Toolbar: 3D Objects
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Introduction
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Modeler Boolean Operations/Transformations Modeler > Boolean
>
Unite combine multiple primitives
Unite disjoint objects (Separate Bodies to separate)
Subtract remove part of a primitive from another
Intersect keep only the parts of primitives that overlap
Split break primitives into multiple parts along a plane (XY,
YZ, XZ)
Split Crossing Objects splits objects along a plane (XY, YZ, XZ)
only where they intersect
Separate Bodies separates objects which are united but not
physically connected into individual objects
Modeler > Surfaces > Move Faces Resize or Reposition an
objects face along a normal or vector.
Edit > Arrange >
Move Translates the structure along a vector
Rotate Rotates the shape around a coordinate axis by an
angle
Mirror Mirrors the shape around a specified plane
Offset Performs a uniform scale in x, y, and z.
Edit > Duplicate >
Along Line Create multiple copies of an object along a
vector
Around Axis Create multiple copies of an object rotated by a
fixed angle around the x, y, or z axis
Mirror - Mirrors the shape around a specified plane and creates
a duplicate
Edit > Scale Allows non-uniform scaling in the x, y, or z
direction
Toolbar: Boolean
Toolbar: Arrange
Toolbar: Duplicate
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Polyline Cross Section New
Choose Cross Section Type and Size
Type: Line, Rectangle, Circle
Size can be a variable
Section is automatically swept along the polyline
1. Create a Polyline 2. Set Cross Section Property 3. Polyline
with Cross Section Property
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Chamfers and Fillets
Create Chamfers and Fillets on 3D or 2D Objects Select a vertex
graphically and choose the menu item:
Fillet or Chamfer
Chamfer - 45 degree cut
Fillet- Rounded edge
Original
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Imprint/Imprint Projection
Imprint New
Projection
Patch Antenna Array Imprinted on a Nosecone
Results in Faces of original object imprinted
Make sure that the distance selected is greater than the
distance between the antenna and nosecone
Face created from
imprint
Face created from
Imprint projection
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Geometry Wrap New
Wrap a 2D sheet on an arbitrary geometry
Slot Coupled Patch Array wrapped on a
cylinder
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(Overlap between two cylinders)
Overlapping Geometry Definition: When an object occupies volume
in multiple 3D objects. This does not apply to sheet objects
Solution:
Resolution: Set Material Override
Menu item: HFSS > Design Settings
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Modeler - Selection
Selection Types
Object (Default)
Face
Edge
Vertex
Selection Modes
All Objects
All Visible Object
By Name
Highlight Selection Dynamically By default, moving the mouse
pointer over an object will dynamically highlight the object for
selection. To select the object simply click the left mouse
button.
Multiple Object Selection Hold the CTRL key down to graphically
select multiple objects
Next Behind To select an object located behind another object,
select the front object, press the b key to get the next behind.
Note: The mouse pointer must be located such that the next behind
object is under the mouse
pointer.
To Disable: Select the menu item Tools > Options > 3D
Modeler Options
From the Display Tab, uncheck Highlight selection
dynamically
Dynamically Highlighted
(Only frame of object)
Selected
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Enhanced Selection Options New
Select By Area
Click and drag to rubber-band select
Right-to-left selects all objects in passing through bounding
box
Left-to-right select all objects enclosed by bounding box
Select By Variable
Helps find objects tied to variables
Select Variable and Click OK to highlight geometry
Select By Area
By default, only items with external surfaces are selected
Material filters
Enable the Include and Exclude radio buttons
Object name filters
Enable the Exclude and Include check boxes
Object type filters
Enable the check boxes for including Solids, Sheets,
and/or Lines
Hide unfiltered objects
Makes unfiltered objects transparent after selection
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Modeler Moving Around
Step 1: Start Point Step 2: Hold X key and select vertex
point
Step 3: CTRL+Enter Keys set a local reference Step 4: Hold Z key
and set height
Edge Center Snap
Toolbar: Snap Mode
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Measure
Modeler > Measure >
Position Points and Distance
Length Edge Length
Area Surface Area
Volume Object Volume
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Step 1: Select Face Step 2: Select Origin
Step 3: Set X-Axis New Working CS
Modeler Coordinate System Can be Parameterized
Working Coordinate System
Currently selected CS. This can be a local or global CS
Global CS
The default fixed coordinate system
Relative CS
User defined local coordinate system.
Offset
Rotated
Both
Face CS (setting available to automatically switch to face
coordinate system in the 3D Modeler Options)
Cone created with Face CS
Change Box Size and Cone is
automatically positioned with
the top face of the box
Toolbar: Coordinate System
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Modeler Model Tree Select menu item Modeler > Group by
Material
Grouped by Material Object View
Material
Object
Object Command
History
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Modeler Commands Parametric Technology
Dynamic Edits - Change Dimensions
Add Variables
Project Variables (Global), Design Variables (Local), or Post
Processing Variables
Animate Geometry
Include Units Default Unit is meters
Supports mixed Units
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Post-Processing Variables
Post Processing Variables New
Can be modified without re-simulating the model
Can optimize complex weights of antenna elements in phased
array
Optimization of Phased Array Excitations
Synthesized Far-field Pattern Specify Desired Scan Angle and
Maximum Sidelobe Level
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Automatic Feature Removal
Holes
Blends
Step 1: Enter Feature Detection Options
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Automatic Feature Removal
Removed
Note: There are two modes of operation for the feature removal:
Healing
and Model Analysis. Model Analysis was used here and allows the
user to
manually select which geometry features are removed. For
healing, all
features that meet the user defined criteria are automatically
removed.
Both options are found in the menu item Modeler > Model
Analysis
Step 2: Select Features to Remove
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HFSS Matrix Data HFSS > Results > Solution Data
Export
NMF, Touchstone, Data Tables, Citifile, MATLAB (*.m)
NOTE: Make sure the Simulation is set to a Sweep before
exporting. The Adaptive Passes will only export a single frequency
point.
Equivalent Circuit Export
HSPICE, PSPICE, Spectre, Maxwell SPICE
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Convergence Based on Multiple Output Variables
Evaluate and save multiple expressions vs. adaptive pass New
Includes SYZ parameters, local, near and far field
Fully integrated with reporter and Optimetrics
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Results Data Management HFSS > Results > Browse
Solutions
Solved model variations are retained. Unless otherwise notified
by HFSS.
HFSS > Results > Clean Up Solutions
HFSS > Results > Import Solutions
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Results Create Reports HFSS > Results > Create Report
Show: Create Differential and/or Terminal plots
Output Variables
User Defined Equations
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New Plot Type
Rectangular Stacked Plot New
Plot all variations in stacked format
1.00 1.50 2.00 2.50 3.00 3.50Freq [GHz]
-25.00
-15.00
-5.00
-12.00
-7.00
-2.00
-22.50
-12.50
-2.50
-30.00
-20.00
-10.00
0.00
-0.50
-0.30
-0.10
-25.00
-15.00
-5.00
Curve Info
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1feed_xpos='-0.5cm'
feed_ypos='-0.5cm'
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1feed_xpos='0cm'
feed_ypos='-0.5cm'
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1feed_xpos='0.5cm'
feed_ypos='-0.5cm'
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1feed_xpos='-0.5cm'
feed_ypos='0cm'
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1feed_xpos='0cm'
feed_ypos='0cm'
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1feed_xpos='0.5cm'
feed_ypos='0cm'
Ansoft LLC HFSSDesign1XY Stacked Plot 1
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Fields Select Object Volume, Surface, or Line to display
fields
Menu item: HFSS > Fields > Plot Fields >
Modify Plot Solution/Frequency/Qty
Plot Attributes
Edit Sources Change Excitation without resolving
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Edit Sources with Port Post-Processing
Option for port post-processing to affect sources for field
plots New
Original Including Post Processing Effects
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Streamline Plot
New plot type for field quantities New
Pick source face, choose Poynting Vector, tick Streamline
option
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Mesh Display Field Overlay
Select an object
Select the menu item HFSS > Fields > Plot Mesh
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GUI
Mesh Solver
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Initial Mesh Overview
Ansoft TAU Mesh New
Strict or Tolerant
Effective on imported geometries
Automatic healing and repair
Ansoft Classic Mesh V11 Mesh Algorithm
Meshing Method
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Curvilinear Elements
Curvilinear Elements New
Most accurate solution to fields on curved structures
Mesh adapted about curved or true surfaces
Element matrices computed using the curved boundaries
Reduces solution time and RAM usage
A smaller, coarser mesh achieves equivalent accuracy
Default: DisabledRectilinear mesh element Curvilinear mesh
element
Red HFSS
Blue Analytic Curve
10 cm radius PEC sphere
solved from 0.040 - 2 GHz
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Dependent Solve Setup
Initial mesh options Allows user to specify another simulation's
mesh as starting mesh
Both simulations must be geometrically identical
Common uses Changing material properties without re-meshing
Defining multiple solution frequencies for meshing
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Dependent Solve Example
Dual-band patch antenna Use solution setups at 2.4 GHz and 5.5
GHz
Starting mesh uses final mesh from other resonant frequency
1.00 2.00 3.00 4.00 5.00 6.00Freq [GHz]
-14.00
-12.00
-10.00
-8.00
-6.00
-4.00
-2.00
0.00
dB
(St(
coax_pin
_T
1,c
oax_pin
_T
1))
Ansoft Corporation HFSSDesign2XY Plot 1
m2
m1
Curve Info
dB(St(coax_pin_T1,coax_pin_T1))Setup1 : Sweep1
Name X Y
m1 2.4625 -8.6805
m2 5.5438 -12.2778
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GUI
SolverMesh
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Solver Technology Overview
Solution Options Direct
Default technique
Solves matrix equation Ax=b
Multi-frontal Sparse Matrix Solver to find the inverse of A
Solves for all excitations(b) simultaneously
Iterative
Added in V11
Reduces RAM and can improve simulation speed
Solves matrix equation MAx=Mb
M is a preconditioner For HFSS this is a lower order basis
function solution
Major computation is the matrix-vector multiplication: (MA)x
Iterates for each excitation Simultaneously solve using SMP
(MP/HPC License)
Iterative Solver is more sensitive to mesh quality
Benefits from TAU Meshing
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Example Basis Functions & Iterative Solver
How many passes on computer w/8GB RAM?
Direct: 3 Passes Iterative: 11 Passes
Copper Wall
Increased Capacity (4x)
IterativeDirect
4x Capacity on Same Machine
2x Unknowns 2x Memory
Volume: 447cubic wavelengths
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Iterative Direct
Iterative Direct
3.2x Less RAM
6.4x Faster
Iterative and Direct
Converge in 3 Passes
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Solver Technology Overview
Order of Basis Functions Hierarchical basis functions
Introduced in V11
Zero or First or Second order basis functions
Higher-order elements have increased accuracy
Convergence is a function of basis order
Mixed Order New
hp-FEM Method
Refines element order(p) and element size(h)
Automatically distributes element order based on element
size
Generates optimum combination of hierarchical basis functions
(Zero and First and Second)
Efficient use of computing resources
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