Workshop 2.2: Coax Bend Finite Conductivity Boundary

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HFSS GS WS2.2

HFSS Getting Started

Release 2020 R2

Workshop 2.2: Coax Bend Finite Conductivity Boundary


Overview - Coax Bend Finite Conductivity Boundary Assignment

This workshop changes the default PEC boundary on the HFSS coaxbend example to finite conductivity.

The three objectives of the workshop are:

1. Gain familiarity with the default PEC boundary

2. Learn how to assign boundary conditions to external object faces

3. Copy and paste signal data for comparison to updated simulations

Input File:

coaxbendFC0.aedtzBased on the HFSS coaxbend example but with the Optimetrics setup removed.

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The final coaxbend structure showing the finite conductivity boundary


Coax Bend Finite Conductivity Boundary Workshop Outline

Here are the steps in this workshop:

▪ Open project archive coaxbendFC0.aedtz

▪ Simulation #1 coaxbendFC1 PEC boundaries

▪ View two different S-parameter plots

▪ Copy the data from the signals into the same plot.

▪ Save project to coaxbendFC2.aedt

▪ Select the vacuum outer object.

▪ Assign a finite conductivity boundary condition to the outer face surface of the coax object. coaxbendFC2

▪ Simulation #2 coaxbendFC2 finite conductivity

▪ Compare the finite conductivity boundary simulation with the PEC boundary simulation. coaxbendFC2

Final File: coaxbendFC2.aedt

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The final coaxbend Project Manager structure showing the finite conductivity boundary


Launch AEDT - Open HFSS Project coaxbendFC0.aedtz

Open the Ansys Electronics Desktop (AEDT) and the archived example project coaxbendFC0.aedtz …

• To access HFSS click the Microsoft Start button, select Programs > ANSYS EM Suite 20XXRY > ANSYS Electronics DesktopA new Project1 appears under the Project Manager.

• In the Ribbon, in the Desktop tab, select the icon: Restore Archive

• Browse to the workshop directory and click on coaxbendFC0.aedtz

z refers to archive

• Select Open

• When the browser changes to Project File Restore Location, Savethe file coaxbendFC0.aedt in a working directory.

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Save HFSS Project coaxbendFC0.aedt to coaxbendFC1

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This is the initial project coaxbendFC0.aedt

• Save the project to coaxbendFC1.aedt

Why immediately save to a different name?

The idea is to carefully preserve the starting point in case we need to backtrack or repeat steps from the beginning for any reason at all. coaxbendFC1.aedt will be different when finished.


Validate and Analyze HFSS Project coaxbendFC1 - Simulation #1

– In the Ribbon, with the Simulation tab selected, click the Validategreen check mark to validate the project.

– Click on Analyze All in the Ribbon to start the HFSS simulation.

The Validation Check and Analyze All operations are also available from the HFSS pull-down at the top of the graphical user interface (GUI).

– Watch the Progress Window and the Message Manager to see when the simulation finishes.

Keep all HFSS workshop simulation files; future workshops continue with these files.


View S12 & S11 Scattering Parameter Results - coaxbendFC1

– In the Project Manager, expand Results and double-click on the S12 S11 Report.

S12 is right on the 0.00 line at the top here.

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View S21 Scattering Parameter Transmission Result - coaxbendFC1

– In the Project Manager, expand Results and double-click on the S211 Report.

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Copy Data from both Reports and Paste in Same Plot

We're going to copy the data in these two Report plots and paste it back into the same Report as static data that will not update when changes are resimulated.

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– In the Project Manager, Under Results, with the Report expanded, right-click on the signal name(e.g. S21) and select Copy Data.

– Right-click on the Report and select paste. – Right-click on the new signal and select Rename. – Rename the new signal to dB(S2,1))_PEC.

– Repeat this same process for the signals in the other Report.


View Overlapped S21 Transmission Scattering Parameter Result

It appears as if there is one signal because the identical signals overlap for now.

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The imported label tells us which one is

the copied data.

The other option is to Copy Definition, which would yield a "live" signal that would update with changes and resimulation.


Select the Solid vacuum Object outer - coaxbendFC2

– Save the project to coaxbendFC2. – In the Project Manager, double-click on the design name to get back to the geometry view in the 3D Modeler.

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– Select the object outer. This can be done by pointing and clicking in the 3D Modeler or by clicking in the 3DModeler Tree under Solids and under vacuum.

This magenta pink color indicates selected.

Double-click on HFSSDesign1 to bring the 3D Modeler back into view.


Open Finite Conductivity Boundary Window

With the object outer selected …

– Right-click on outer and select Assign Boundary > Finite Conductivity… to bring up the Finite Conductivity Boundarywindow.

… continued …

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"Right-click on outer" can be done two different ways. In the graphic, the right-click was on the object outer in the 3D Modeler Tree. One can also right-click on the selected object in the 3D Modeler.

A third approach starts at the top of the GUI select HFSS to and select A HFSS > Boundary > Assign > Finite Conductivity…


Assign Finite Conductivity Boundary to Solid vacuum Object outer

– In the Finite Conductivity Boundarywindow, accept the defaults and click OK to finish the assignment and close the window.

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What metal has 5.8 e7 Siemens/meter conductivity?

.. .copper

In later examples we'll check the Use Material box and pick from a Materials List.


The Finite Conductivity Boundary Appears in the Project Manager

The new finite conductivity boundary is selected in the Project Manager.

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The new project name is coaxbendFC2.


Validate and Analyze HFSS Project coaxbendFC2 - Simulation #2

– In the Ribbon, with the Simulation tab selected, click the Validategreen check mark to validate the project.

– Click on Analyze All in the Ribbon to start the HFSS simulation.

The Validation Check and Analyze All operations are also available from the HFSS pull-down at the top of the graphical user interface (GUI).

– Watch the Progress Window and the Message Manager to see when the simulation finishes.


View S12 & S11 Scattering Parameter Results - coaxbendFC2

– In the Project Manager, expand Results and double-click on the S12 S11 Report.

The new S11 with copper conductivity is higher (more reflection) than the PEC version.

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View S21 Scattering Parameter Transmission Result - coaxbendFC2

– In the Project Manager, expand Results and double-click on the S211 Report.

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End of Presentation

Workshop 2.2: Coax Bend Finite Conductivity Boundary

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