14 2 Hfss-Ant Hfssie Rcs Ws

Chapter 14.2: HFSS‐IE Workshop (RCS: PEC Cube) 14. 0 Release

Introduction to ANSYS HFSS for Antenna Design

HFSS-IE Example: PEC Cubic RCS • Radar Cross Section of a PEC Cube  –  This example is intended to show you how to create, simulate, and analyze the RCS of a PEC Cube, using the Ansoft HFSS-IE Design Environment.

 –  This example was taken from the publication, “Electromagnetic Code Consortium Benchmarks,” compiled by Andrew Greenwood and published by the Air Force Research Laboratory.

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Background • Background on RCS and PEC Cube problem  –   As mentioned previously, this problem was taken from a paper illustrating some simple radar targets that can be used to “calibrate” electromagnetic simulators. The paper used several different university codes for the different targets.

 –   Also mentioned in the lecture notes are the two measurements of RCS, Monostatic and Bistatic. The measurements from the paper which we will simulate in HFSS-IE are shown below in the graphs, and represents Monostatic RCS.

 –  From this graph, we can obtain some settings for the HFSS-IE simulation: • Adaptive Frequency: 0.43 GHz – Single frequency / no sweep • Azimuth (f) swept with a fixed Elevation

 –  q = 90°  –  f = 0° to 90° – since the structure is symmetric about the axis, we won’t simulate the remaining quadrants • VV-polarized – Excite the vertical polarization (q) and observe the vertical polarization (q)

 –  Ephi = 0 / Etheta = 1  –  Observe MonostaticRCSTheta  ANSYS, 14.2-3 Inc. ©Proprietary 2012 ANSYS, Inc. © 2009 ANSYS, Inc. All rights reserved.

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Getting Started • Ansoft HFSS-IE Design Environment  –  The following features of the Ansoft HFSS-IE Design Environment will be used to create this passive device model • 3D Solid Modeling

 –  Primitives: Boxes • Boundaries/Excitations

 –  Ports: Incident Wave  –  Boundaries: Default Open Space • Analysis

 –   Adaptive Solution Setup • Results

 –  Far-Field Setup  –  Cartesian Plotting

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Getting Started • Launching Ansoft HFSS  –  To access Ansoft HFSS, click the Microsoft Start button, select Programs, and select the Ansoft, HFSS 14.0 program group, Windows 64-bit. Click HFSS 14.0 (64-bit or 32-bit)

• Setting Tool Options  –  Note: In order to follow the steps outlined in this example, verify that the following tool options are set : • Select the menu item Tools > Options > HFSS-IE Options

 –  Click the General tab • Use Wizards for data input when creating new boundaries:

Checked

Checked

• Duplicate boundaries with geometry:

 –  Click the OK button • Select the menu item Tools > Options > Modeler Options .

 –  Click the Operation tab • Automatically cover closed polylines:

Checked

 –  Click the Drawing tab • Edit property of new primitives:

Checked

 –  Click the OK button

• Opening a New Project  –  In HFSS Desktop, click the

On the Standard toolbar, or select the menu item File > New . 

 –  From the Project menu, select Insert HFSS-IE Design.

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Example – RCS of a Cube • Set Model Units  –  Select the menu item Modeler > Units • Select Units: meter  • Click the OK button

• Set Default Material  –  Using the 3D Modeler Materials toolbar, choose Select • Type pec in the Search by Name field • Click the OK button

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Example – RCS of a Cube • Creating the Cube  –  Select the menu item Draw > Box  • Using the coordinate entry fields, enter the box origin

 –  X: -0.5, Y: -0.5, Z: -0.5, Press the Enter key • Using the coordinate entry fields, enter the size of the box:

 –  dX: 1, dY: 1, dZ: 1, Press the Enter key  –  Select the Attribute tab from the Properties window. • For the Value of Name type: cube • Click the OK button

 –  To fit the view: • Select the menu item View > Fit All > Active View . Or press CTRL+D

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Plane Wave Excitation Setup • Creating the Plane Wave Excitation  –  Select the menu item HFSS-IE > Excitations >Assign > Incident Wave > Plane Incident Wave • Vector Input Format: Spherical • Excitation Location and/or Zero Phase Position

 –  X Coord: 0mm, Y Coord: 0mm, Z Coord: 0mm  –  Click the Next button • IWavePhi – Start: 0 deg, Step: 1 deg, Stop: 90 deg • IWaveTheta – Start: 90 deg, Step: 0 deg, Stop: 90 deg • E0 vector – Phi: 0V/m, Theta: 1 V/m

 –  Click the Next button  –  Click the Finish button

• Viewing the Plane Wave Excitation  –  The Incident Plane Wave excitation can be viewed by selecting the IncPWave1 in the Excitation section of the Project tree

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Analysis Setup • Analysis Setup  –  Select the menu item HFSS-IE > Analysis Setup > Add Solution Setup • Click the General tab:

 –  Solution Frequency: 0.43 GHz  –  Maximum Number of Passes: 20  –  Maximum Delta E per Pass: 0.01 • Click the OK button

• Create a Radiation Setup  –  Select the menu item HFSS-IE > Radiation > Insert Far Field Setup > Infinite Sphere • Infinite Sphere Tab

 –  Name: Infinite Sphere1  –  Phi: (Start: 0, Stop: 0, Step Size: 10)  –  Theta: (Start: 0, Stop: 0, Step Size: 10) • Click the OK button • NOTE: Since we are going to be creating a plot of Monostatic RCS, HFSS-IE takes the observation angle from the incident angle definition. It is actually easier in the plotting stage to only define one observation angle in the far field sphere setup.

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Analyze • Save Project  –  Select the menu item File > Save As . • Filename: hfssie_rcs_cube • Click the Save button

• Model Validation  –  Select the menu item HFSS-IE > Validation Check  • Click the Close button

 –  Note: To view any errors or warning messages, use the Message Manager.

• Analyze  –  Select the menu item HFSS-IE > Analyze All 

• Solution Data  –  Select the menu item HFSS-IE > Results > Solution Data  –  To view the Profile, Click the Profile Tab.  –  To view the Convergence, Click the Convergence Tab • Note: The default view is for convergence is Table. Select the Plot button to view a graphical representations of the convergence data.

 –  To view the Matrix Data, Click the Matrix Data Tab • Note: To view a real-time update of the Matrix Data, set the Simulation to Setup1, Last Adaptive

 –  To view the Mesh Statistics, Click the Mesh Statistics Tab. • Click the Close button

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Results • Create RCS plot  –  Select the menu item HFSS-IE > Results > Create Far Fields Report > Rectangular Plot  • Solution: Setup1: LastAdaptive • Geometry: Infinite Sphere1 • Primary Sweep: IWavePhi • Category: MonostaticRCS • Quantity: MonostaticRCSTheta • Function: dB • Click the New Report button

 –  Click the Close button

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Release 14.0 February 23, 2009

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