Coaxial feed microstrip patch antenna using HFSS

Study of Ansoft
High Frequency Structure Simulator
Guided By Presented By
Prof. P D Kale Mithilesh Naphade
Payal Wankhade
Dipika Deotalu

Contents
 INTRODUCTION
 MAIN FEATURES
 VARIOUS SOFTWARES IN COMMUNICATION
 GETTING STARTED WITH HFSS
 EXAMPLE OF SIMULATION
 ADVANTAGES
 CONCLUSION
 REFERENCES

Introduction
 The name HFSS stands for High Frequency Structure Simulator.
 Ansoft HFSS software is the industry standard for simulating 3-D full-
wave electromagnetic fields.
 Its gold-standard accuracy, advanced solver and compute technology
have made it an essential tool for engineers designing high-frequency
and high-speed electronics components.

 Automatic Adaptive Meshing
 Solver Technologies
 Advanced Finite Element Method Technology
 Mesh Element Technologies
 Optimization and Statistical Analysis
 EDA Design Flow Integration
 High-Performance Computing
Main Features

Various Software in Communication
 E-MoM HP-Momentum
 IE3D
 FEKO
 Empire
 CST
 HFSS

Getting Started with HFSS
 Installing the Ansoft HFSS Software
 Starting Ansoft HFSS
 Getting Help
 Ansoft Technical Support

Create the New Project
 Click File>New.
 A new project is listed in the project tree in the
Project Manager window.
Inserting an HFSS Design
 Click Project>Insert HFSS Design or Insert
HFSS-IE Design.
 The new design is listed in the project tree. It is
named HFSS Design .
 The 3D Modeler window appears to the right of
the Project Manager. You can now create the
model geometry.

Inserting an HFSS Design
 Click Project>Insert HFSS Design or Insert HFSS-IE
Design.
 The new design is listed in the project tree. It is named
HFSS Design or HFSS-IE Design by default, where n
is the order in which the design was added to the
project.
 The 3D Modeler window appears to the right of the
Project Manager. You can now create the model
geometry.

Selecting the Solution Type
 Click HFSS>Solution Type. The Solution Type dialog box appears.
 Select one of the following solution types
1. Driven Mode
2. Driven Terminal
3. Eigenmode
Setting Units of Measurement for the Model
To set the model’s units of measurement:
1. Click Modeler>Units. The Set Model Units dialog box appears.
2. Select the new units for the model from the Select units pull-down list.

Assigning Materials
You can add, remove, and edit materials in two main ways
• Using the Tools>Edit Configured Libraries>Materials menu command.
• Right-clicking Materials in the project tree and selecting Edit All Libraries.
To assign a material to an object, follow this
general procedure:
1. Select the object to which you want to
assign a material.
2. Click Modeler>Assign Material

Running Simulations
For Analyze command
 Right-click on a setup or sweep in the Project tree,
and click the command on the context menu.
 The Analyze All command applies to all enable
setup
 To use this command, either click HFSS>Analyze
All or right-click on the Analysis icon in the Project
tree and select Analyze All from the popup menu.

Example of Simulation in HFSS
Simulation of Microstrip Patch Antenna
Creating the Project
Launch HFSS and open new project and name it as
“Probe_Feed_Patch_Antenna”
Then set the solution type:
1. Select the menu item HFSS > Solution Type - choose Driven
Terminal - click Ok button as shown in figure
2. To set the units .Select the menu item 3D Modeler > Units -
select Units: cm - click ok button as shown in figure
3. Creating the Probe Feed Patch Antenna

Creating Microstrip Patch Antenna
Adding Substrate
To draw the Substrate, click on the toolbar. Then draw a box by filling the
following data as shown below.

2 - To draw the Patch, click on the toolbar. Then draw rectangle by filling
the data same as like filled in substrate .
3 – Then the Ground is prepared as like of patch taking its suitable value.

Coax Cable
 The antenna is excited using a coax cable port. This port is located under the patch
 To draw the coax cable port, we start by drawing the infinite ground Cut Out as shown
below
 Then select the Ground & Cut _ Out, right click, select Edit > Boolean > Subtract

Create the coax
So to create the coax, select the menu item Draw > Cylinder, then enter the data

Create the Coax Pin
Select the menu item Draw > Cylinder, then enter the data

Create the Wave port to create a circle that represents the port
Select the menu item Draw > Circle,

To assign wave port excitation, select Port 1, then
go to menu item HFSS > Excitations > Assign >
Wave port

Create the Probe To create the probe, select the menu item Draw > Cylinder, then enter
the data

To draw the Air Box, click on the toolbar. Then draw a box by filling the
following data .
Now select Box 1, right click > Assign
Boundary > Radiation

Analysis Setup
 Select the menu item HFSS > Analysis Setup > Add Solution Setup.
 In the Solution Setup window, click the general tab, Solution frequency is 2.55 GHz,
 Maximum Number of Passes is 20 .
Adding Frequency Sweep
To add a frequency sweep, select the menu item HFSS > Analysis Setup > Add Sweep.
Select Solution Setup Setup1. Click OK button. Then Edit Sweep Window.
 Sweep Type: Fast
 Frequency Setup Type: Linear Count
 Start: 1 GHz
 Stop: 3 GHz,
 Count: 200. Click OK button.

8 – Model Validation
To validate the model, select the menu HFSS > Validation Check. Click the
Close button. To view any errors or warnings messages, use the Message
Manager.
9 – Analyze
To start the solution process, select the menu item HFSS > Analyze.
10- Solution Data
The simulation will stop as
soon as the results converge,
which is at pass 10

Create Reports
To create a report, select Results > Create Report.
Set Report Type to Modal S Parameters, Display
Type to Rectangular then click OK button

 In the Traces Window, set Solution to Setup1:
Adaptive1.
 In the Y tab, set Category to S Parameter, Quantity
to S function to dB and click Add Trace button.
 Click done button.
 Note that you can create any type of report it all
depends on what you want to analyze specifically

 To create a 2D polar far field plot go to Results >
create Report. change the Report Type to Far
Field
 Display type to Radiation Pattern
 C
 Click OK.

1. 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.
2. 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. .
3. 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.
Advantages

Conclusion
The simulation of microstrip patch antenna is carried out. The various
methodology necessary for simulation are done. The substrate and patches are
created. The radiation pattern are observed. Rectangular patch antenna at 2.4
GHz is designed on Ansoft HFSS. The designed antenna is suitable for Mobile
Communication, Cell Phone Antennas etc.
The HFSS can be used to small planar antenna topologies can be found in
Input impedance and radiation patterns. Few results are found about the
efficiency. It is one of several commercial tools used for antenna design, and
the design of complex RF electronic elements including filters, transmission
lines, and packaging .

References
[1] Dr. Ravi M. Yadahalli1, “Compact broadband coupled probe
fed microstrip antenna for wireless applications” IJETR, Vol 1(2):
July-2012
[2] www.ansys.com
[3]http://www.cnam.umd.edu/anlage/HFSSv13UserGuide.pdf
[4] Ansys HFSS software

Coaxial feed microstrip patch antenna using HFSS

Coaxial feed microstrip patch antenna using HFSS

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