High Frequency Structure Simulator (HFSS)
Tutorial
Prepared by
Dr. Otman El Mrabet
IETR, UMR CNRS 6164, INSA, 20 avenue Butte des Coësmes 35043 Rennes, FRANCE
2005 - 2006
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example2, Lecture notes of Antenna Theory and Analysis
HFSS Example 2
Typology: Lecture notes
2013/2014
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High Frequency Structure Simulator (HFSS)
Tutorial
Prepared by Dr. Otman El Mrabet
IETR, UMR CNRS 6164, INSA, 20 avenue Butte des Coësmes 35043 Rennes, FRANCE
2005 - 2006
TABLE OF CONTENTS
INTRODUCTION .................................................................................................................... III
HIGH FREQUENCY STRUCTURE SIMULAOR (HFSS) ................................................ IV
CHAPTER ONE – THE DIPOLE ANTENNA ........................................................................ 1
CHAPTER TWO – THE RECTANGULAR PATCH ANTENNA ...................................... 22
CHAPTER THREE – PROBE FEED PATCH ANTENNA .................................................
CHAPTER FOUR – THE TRIANGULAR MICROSTRIP ANTENNA ............................ 48
PROJECTS
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High Frequency Simulator Structure (HFSS)
HFSS is a high performance full wave electromagnetic (EM) field simulator for arbitrary 3D volumetric passive device modelling that takes advantage of the familiar Microsoft Windows graphical user interface. It integrates simulation, visualization, solid modelling, and automation in an easy to learn environment where solutions to your 3D EM problems are quickly and accurate 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:
Package Modelling – BGA, QFP, Flip-Chip PCB Board Modelling – Power/ Ground planes, Mesh Grid Grounds, Backplanes Silicon/GaAs-Spiral Inductors, Transformers EMC/EMI – Mobile Communications – Patches, Dipoles, Horns, Conformal Cell Phone Antennas, Quadrafilar Helix, Specific Absorption Rate ( SAR), Infinite Arrays, Radar Section (RCS), Frequency Selective Surface (FSS) Connectors – Coax, SFP/XFP, Backplane, Transitions Waveguide – Filters, Resonators, Transitions, Couplers Filters – Cavity Filters, Microstrip, Dielectric HFSS is an interactive simulation system whose basic mesh element is a tetrahedron. This allows you to solve any arbitrary 3D geometry, especially
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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 Strucutre 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 Lancozos - 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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From the from the sub menu. Project Manager window. Right-Click the project file and select Save As
Name the file “ dipole ” and Click Save.
Note: HFSS projects. Before click on “Enregistrer”, always create a personal folder to store all
3- Working with geometries
To begin working with geometries.
- you must insert an HFSS design. Right-Click the project file and select > Insert HFSS Design from the menu. Insert
- Or click on from the toolbars.
Due to the nature of this design we will useFrom the HFSS menu select Solution Type and Driven Modal Driven Modal (^) .as the solution type.
This will open the variable table. Add all variables shown below by selecting Add. Besure to include units as needed.
The final variable table should looks like
4- Drawing the Dipole
We will start to by creating the dipole element using the from the toolbar. Draw Cylinder button
By default the proprieties dialog will appear after you have finished drawing anobject. The position and size of objects can be modified from the dialog.
Follow the format above for structure size. Give the name dip1 to this object. Assignthe material PEC and click OK. PEC (Perfect Electric Conductor) will create ideal conditions for the element. The next step is to build the symmetric of dip1. To do that, Right -Click the drawingarea and select Edit -> Duplicate -> Around Axis.
The dipole structure is illustrated below:
5- Creating the port
In the section you will create ato the dipole structure. Begin by selecting the YZ plane from the toolbar. Using the Lumped Gap Source. This will provide an excitation 3D toolbar, click Draw Rectangle and place two arbitrary points within the modelarea. Select YZ plane Draw rectangle
Enter the following information
Click Next and enter the following:
Using the mouse, position the cursor to the bottom-center of the port. Ansoft's snapfeature should place the pointer when the user approaches the center of any object. Left-click to define the origin of the E-field vector. Move the cursor to the top-centerof the port. Left-click to terminate the E-field vector. Click finish to complete the port excitation.
Note: the rectangular plane, affect the lumped port, then resize the rectangular plane. In case you find some difficulties for drawing the lumped port, you can redraw
6- Radiation Boundary
In this section, a radiation boundary is created so that far field information may beextracted from the structure. To obtain the best result, a cylindrical air boundary is defined with a distance of λ/4. From the toolbar, select Draw Cylinder.
Enter the following information:
Leave the default name Rad1 and click OK.
7- Solution Setup
In this section a solution must be defined to display the desired data. We are primarilyinterested in the frequency response of the structure. We will also explore HFSS's ability to calculate general antenna parameters such as directivity, radiation resistance,radiation efficiency, etc.... From the project explorer, select Analysis -> Add Solution Setup.
Enter the following. Click ok when complete.
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To view the frequency response of the structure, a frequency sweep must be defined.From the project explorer select Setup1 -> Add Sweep.
Enter the following