Power Splitter simulation with CST

CST – COMPUTER SIMULATION TECHNOLOGY | www.cst.com | Feb-13

Workflow Example

Microstrip Power Splitter

Purpose:

Optimize the structure such that

the reflection is minimal at 6 GHz.


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.

CST MWS - Standard Workflow


Microstrip Power Splitter

Units: mm, GHz

Frequency Range: 0-8 GHz

Substrate: 11.308 mm x 5.2 mm x 0.635 mm, permittivity εr=9

Height of Metallization: 0.017 mm

Chamfer Edge Width: 0.8 mm

Electric Boundaries

E-field, H-field, and Power Monitors at 6 GHz

11.308 5.2

0.635


New Project Template

At the beginning, choose “File” “New” to create a new project.

For an existing project you may choose “File” “Select Template”.

The project templates customize the default settings

for particular types of applications.


Units & Background Material

Background Material Units

Those settings have been set correctly by the project template.


Microstrip Power Splitter Construction (I)

Define a brick and define a

new material “substrate”.


Microstrip Power Splitter Construction (II)

Pick the midpoint of the top edge. Align the WCS with the picked

point.


Microstrip Power Splitter Construction (III)

Define the profile of the

microstrip line.

Enter the polygon

points.

Please note that a text (ASCII) file

containing the polygon data can be

directly loaded into CST MWS.


Microstrip Power Splitter Construction (IV)

Preview of the metallization Final metallization


Microstrip Power Splitter Construction (V)

Pick the

short edge.

Chamfer the

edge (chamfer

width: 0.8 mm).


Microstrip Power Splitter Construction (VI)

Mirror and copy the

metallization.

Select the metallization in the

tree view.


Offset the picked faces

using the parameter "move".

Microstrip Power Splitter Construction (VII)

Pick faces.

Pick the small faces of the metallization.

Define a variable

“move” and set move=1.


Pick the points at the upper corner

of the metallization.

Then, pick the midpoint of the

lower edge of the substrate.

Port Definition (I)


Port Definition (II)

Define port 1.


Pick face of the

metallization.

Port Definition (III)


Similarly define port 3.

Port Definition (IV)

Define port 2.


Set Frequency Range

Set the frequency range.


Check boundary conditions.

Those settings have been set correctly by the project template.

Boundary Conditions


3D Field Monitors

Add field monitors for E-field, H-field, and power flow at 6 GHz.


Mesh View (I)

Global Mesh Properties

Mesh for x-y-plane

(press )

Please keep the default mesh settings.


Mesh for x-z-plane (press )

Mesh for y-z-plane (press )

Mesh View (II)


Set S-Parameter Symmetries

Select symmetrical S-parameters and click on “Set Symmetry”.

Use S-parameter symmetry to reduce the simulation time.


Start the Simulation

Time Domain Solver


Analyze 1D Results

Please note that the minimum of S11 is currently at approx. 7.8 GHz.


Analyze 2D/3D Results

Port Information:

• Mode type

• Line impedance

• Propagation constant


E-Field & H-Field at 6 GHz

The plots can be

obtained using the

“clamp to range” option.


Surface Currents & Power Flow at 6 GHz

Power Splitter simulation with CST

Documents

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