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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.
Click on the Create Project Your already defined project templates are listed in the section "Project Templates".
If you haven't defined a project template for your application click on "Create a new project" to create one.
Design of Patch Antenna:Information What we need: 1) 2) 3) 4) 5)
Materials Patch – Radiating Element Substrate – Dielectric Ground Plane 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 CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
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.
Click on Use filter Type Rogers RT 5880 in the Material tab and choose the ROGERS material as highlighted. Once you load them you can see the new material added in the navigation tree. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Patch Antenna Construction: Substrate Go to the 'Modeling' ribbon tab and create a brick with Rogers RT5880 . Type the below values in the opened window Click on brick button
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 doesn’t highlight the face. Please repeat the above step again. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Patch Antenna Construction: Ground Plane
Click on extrude button and it pops out new window and type the shown values. You should see a brown color on the back side of the substrate once this operation is over.
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 coordinate 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. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Patch (Radiating Element) Construction: Go to the 'Modeling' ribbon tab and create a brick with PEC Material.
Click on brick button
Lp : 9.79 Wp : 12.6 T : 0.017
Click on escape button in the key pad of your computer
Pick the mid point of the patch in the lower edge as highlighted in yellow color. Now select Align WCS with selected point. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Coaxial Feed: Inner Pin Dimensions Click on escape button
Click on brick button
rad=0.45 mm Offset=1 mm ts and t already defined CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Coaxial Feed: Dielectric Cylinder Turn the model to the back side of the substrate. A cylinder would have been protruded back with defined dimensions.
STEP 1: Pick bottom face of inner Pin and Align WCS on the selected face CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Dielectric Cylinder: Dimensions
Click on cylinder button
Press Escape
Inner dielectric cylinder is created and highlighted in yellow color CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Boolean Operation Select ground from Components Tree Click on Boolean Choose Insert and then select diel_cyl_1.
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 face and align WCS on the selected face.
Now press the wave guide port icon and it automatically places the waveguide port. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
Boundary Conditions
Now press the icon boundaries and choose the above boundary conditions and then press ok button. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
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. CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | May-14
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.
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 above result which is called reflection coefficient of the antenna.
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 a cross mark once you activate the small window.
Goal for Optimizer •Click 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
