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Workflow ExamplePatch Antenna Simulation

CST COMPUTER SIMULATION TECHNOLOGY | www.cst.com | Jul-14

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 createone.

Your already defined project

templates are listed in the

section "Project Templates".

Click on the Create

Project


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Antennas Template

Click on Antennas


Click on Next


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Type of Antenna

Click on Planar


Click on Next


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Solver Type

Click on Time

Domain


Click on Next


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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) Materials2) Patch Radiating Element

3) Substrate Dielectric

Design of Patch Antenna:Information


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


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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 theopened 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 doesnt highlight

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 thesubstrate 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

Modeling Picks Pick 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 : 12.6

Click on brick

button


T : 0.017

Click on escape button inthe 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

Click on escape

button


rad=0.45 mm

Offset=1 mm

ts and t already

defined

Click on brickbutton


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Coaxial Feed: Dielectric Cylinder

Turn the model to the back side of the

substrate. A cylinder would have been

protruded back with defineddimensions.


STEP 1: Pick bottom face of inner Pin and Align WCS on the selected face


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Dielectric Cylinder: Dimensions

Click on

cylinder

button


Inner dielectric cylinder is

created and highlighted inyellow color

PressEscape


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Boolean Operation

Select ground from Components Tree Click on Boolean Choose Insert and

then select diel_cyl_1.



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Coaxial Feed: Outer Conductor

Press S on the keyboard and now

move the cursor onto the outer

face of the dielectric cylinder it

will highlight automatically.

Double click on the outer faceand 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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Boundary Conditions


Now press the icon boundaries and choose the above boundary

conditions and then press ok button.


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Field Monitors


o to t e e mon tor ta

as shown below. Now rightclick 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 andchoose E field and press ok.

Now click on Farfield/RCSand then press ok.


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Start the Solver

Now go to Home tab and Press


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


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 Goals Press 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 template assign 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.


e e requency range.

Specify boundary and symmetry conditions.

Define monitors.

Check the mesh.

Run the simulation.

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