Tutorial on CST
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Transcript of Tutorial on CST
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CST COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Workflow Example
Patch Antenna Simulation
Purpose:
1. Understanding how to create andanalyze an antenna @9.4 GHz
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New Projects - Project Templates
Project templates are the preferred way to customize CST STUDIO
SUITE automatically for a certain type of application.
If you haven't defined a project template for your
application click on "Create a new project" to create
one.
Your already defined project
templates are listed in the
section "Project Templates".
Click on the CreateProject
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Antennas Template
Click on Next
Click on Antennas
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Type of Antenna
Click on Planar
Click on Next
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Solver Type
Click on Next
Click on Time
Domain
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Units
Click on Next
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Summary of Project Template
Click on Finish
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User Interface
Let us show you...
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What we need:
1) Materials
2) Patch Radiating Element
3) Substrate Dielectric
4) Ground Plane
5) Coax Connector Excitation
Important: Operating frequency of the antenna
For tutorial purpose we have already calculated the parameters
responsible for designing the patch antenna at operating frequency of
9.4 GHz
Design of Patch Antenna:Information
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Material Assignment:
Click on load from
Library
Click on Use filter Type Teflon in the Material tab and choose the Teflon material as
highlighted and please do the same for copper and load them.
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Material Assignment:
Click on Use filter Type Rogers RT 5880 in the Material tab and choose the ROGERSmaterial as highlighted. Once you load them you can see the new material added in the
navigation tree.
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Patch Antenna Construction: Substrate
Go to the 'Modeling' ribbon tab and create a brick with Rogers RT5880 .
Click on Escape
button
Type the below values in the
opened window
Click on brick
button
L= 21.169
ts = 1.5
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Patch Antenna Construction: Ground Plane
Click on picks under Modeling Toolbar Pick Face and select back
face of the substrate
Move the cursor on to the back part of the substrate and it will
highlight automatically the face. Double click on the face and it will
highlight the face as shown above in red color. If it doesnthighlight
the face. Please repeat the above step again.
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Patch Antenna Construction: Ground Plane
Click on extrude button and it pops
out new window and type theshown values. You should see a
brown color on the back side of the
substrate once this operation is
over.
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Patch (Radiating Element) Construction:
Pick top face of the dielectric brick by using pick option under
ModelingPicksPick Face
Activating and
Aligning the local co-
ordinate system
Press S or F and move the cursor on to the front part of the
substrate and it will highlight the face automatically. Double click
on the face and it will highlight the face as shown above in red
color. Once it gets highlighted go to modeling tab and choose the
align WCS option as shown in this slide.
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Patch (Radiating Element) Construction:
Go to the 'Modeling' ribbon tab and create a brick with PEC Material.
Lp : 9.79
Wp : 12.6T : 0.017
Click on brick
button
Click on escape button in
the key pad of your
computer
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Coaxial Feed: Inner Pin
Pick the mid point of the patch in the lower edge as highlighted in yellow color.
Now select Align WCS with selected point.
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Coaxial Feed: Inner Pin Dimensions
rad=0.45 mm
Offset=1 mm
ts and t already
defined
Click on brick
button
Click on escape
button
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Coaxial Feed: Dielectric Cylinder
STEP 1: Pick bottom face of inner Pin and Align WCS on the selected face
Turn the model to the back side of thesubstrate. A cylinder would have been
protruded back with defined
dimensions.
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Dielectric Cylinder: Dimensions
Inner dielectric cylinder is
created and highlighted in
yellow color
Click on
cylinder
button
Press
Escape
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Boolean Operation
Select groundfrom Components Tree Click on BooleanChoose Insertand
then select diel_cyl_1.
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Coaxial Feed: Outer Conductor
Press Son the keyboard and now
move the cursor onto the outerface of the dielectric cylinder it
will highlight automatically.
Double click on the outer face
and align WCS on the selected
face.
Click on
Extrude button
and type the
values shown
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Frequency Range
Click on Frequency and
type the shown values
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Mesh Settings
Click on Global Properties
Click on Specials
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Excitation: Wave Guide Port
Go to the back side of the substrate and now press S or F and choose the bottom
face of the dielectric cylinder.
Inset view of the selected
face
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Waveguide Port Setup
Now press the wave guide port icon and it
automatically places the waveguide port.
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Boundary Conditions
Now press the icon boundaries and choose the above boundary
conditions and then press ok button.
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Field Monitors
Go to the field monitor tab
as shown below. Now right
click on the field monitor it
would show a new field
monitor as high lighted
Click on Frequency and type
9.4 in the frequency tab and
choose E field and press ok.
Now click on Farfield/RCS
and then press ok.
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Start the Solver
Now go to Home tab and Press
the T solver button.
It opens a new window as
shown in this slide. Now choose
the same settings and press
start button.
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Reflection Coefficient of Patch Antenna
Click on the S- Parameters folder and click on plus
symbol and it will display the S1,1 . Click on the
S1,1 and it will display automatically the aboveresult which is called reflection coefficient of the
antenna.
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E- Field Results
Click on 2D Results: Click on E field: Choose Abs of E
field
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Far Field (Radiation Pattern)
Click on Farfields: Click on Farfield (f=9.4)[1]
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Far Field (Radiation Pattern)
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Optimization of Feed Position
Click on Optimizer tab and
it will open the shown
window.
Now choose the offset and
click on the small window
present beside offset
parameter. It will put across mark once you
activate the small window.
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Goal for OptimizerClick on GoalsPress on the Add New Goal button and it will open a new window . Now click on the
result name arrow button and it will show various options. Choose the S11 template. In goal click on
the arrow and select S1,1 templateassign following condition: Move Min to 9.4 GHz
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Final Optimized Result
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CST MWS Standard Workflow
Choose a project template.
Create your model.
parameters + geometry + materials
Define ports.
Set the frequency range.
Specify boundary and symmetry conditions.
Define monitors.
Check the mesh.
Run the simulation.