LAB 2 HFSS Optimizing T Junction

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Transcript of LAB 2 HFSS Optimizing T Junction

Getting Started with Optimetrics:Optimizing a Waveguide T-Junction with HFSS and Optimetrics

ANSYS, Inc. 275 Technology Drive Canonsburg, PA 15317 Tel: (+1) 724 746 3304 Fax: (+1) 724 514 9494 General Information: AnsoftInfo@ansys.com Technical Support: AnsoftTechSupport@ansys.com

October 2010 Inventory 0000002935

The information contained in this document is subject to change without notice. Ansoft makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Ansoft shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. 2010 SAS IP Inc., All rights reserved. ANSYS, Inc. 275 Technology Drive Canonsburg, PA 15317 USA Tel: (+1) 724-746-3304 Fax: (+1) 724-514-9494 General Information: AnsoftInfo@ansys.com Technical Support: AnsoftTechSupport@ansys.com HFSS and Optimetrics are registered trademarks or trademarks of SAS IP Inc.. All other trademarks are the property of their respective owners. New editions of this manual will incorporate all material updated since the previous edition. The manual printing date, which indicates the manuals current edition, changes when a new edition is printed. Minor corrections and updates that are incorporated at reprint do not cause the date to change. Update packages may be issued between editions and contain additional and/or replacement pages to be merged into the manual by the user. Pages that are rearranged due to changes on a previous page are not considered to be revised. Edition 1 2 Da te May 2003 June 2005 S o f tw a r e Ve r s i o n Optimetrics 3.0 HFSS 9.0 Optimetrics 4.0 HFSS 10

Getting Started with Optimetrics: A Waveguide T-Junction

3 4 5

June 2007 February 2009 October 2010

Optimetrics 5.0 HFSS 11 Optimetrics 6.0 HFSS 12 Optimetrics 6.0 HFSS 13.0

iii

Getting Started with Optimetrics: A Waveguide T-Junction

Conventions Used in this GuidePlease take a moment to review how instructions and other useful information are presented in this guide.

Procedures are presented as numbered lists. A single bullet indicates that the procedure has only one step. Bold type is used for the following: - Keyboard entries that should be typed in their entirety exactly as shown. For example, copy file1 means to type the word copy, to type a space, and then to type file1. - On-screen prompts and messages, names of options and text boxes, and menu commands. Menu commands are often separated by carats. For example, click HFSS>Excitations>Assign>Wave Port. - Labeled keys on the computer keyboard. For example, Press Enter means to press the key labeled Enter. Italic type is used for the following: - Emphasis. - The titles of publications. - Keyboard entries when a name or a variable must be typed in place of the words in italics. For example, copy file name means to type the word copy, to type a space, and then to type a file name. The plus sign (+) is used between keyboard keys to indicate that you should press the keys at the same time. For example, Press Shift+F1 means to press the Shift key and the F1 key at the same time. Toolbar buttons serve as shortcuts for executing commands. Toolbar buttons are displayed after the command they execute. For example, On the Draw menu, click Line means that you can click the Draw Line toolbar button to execute the Line command.

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Getting Started with Optimetrics: A Waveguide T-Junction

Getting HelpAnsys Technical SupportTo contact Ansys technical support staff in your geographical area, please log on to the Ansys corporate website, https:// www1.ansys.com. You can also contact your Ansoft account manager in order to obtain this information. All Ansoft software files are ASCII text and can be sent conveniently by e-mail. When reporting difficulties, it is extremely helpful to include specific information about what steps were taken or what stages the simulation reached. This allows more rapid and effective debugging.

Context-Sensitive HelpTo access online help from the HFSS user interface, do one of the following: To open a help topic about a specific HFSS menu command, press Shift+F1, and then click the command or toolbar icon. To open a help topic about a specific HFSS dialog box, open the dialog box, and then press F1.

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Getting Started with Optimetrics: A Waveguide T-Junction

vi

Table of Contents

1. IntroductionUsing Optimetrics with HFSS . . . . . . . . . . . . . . 1-2 About the Nominal Design . . . . . . . . . . . . . . . . . 1-3 Using Optimetrics to Improve the T-Junction Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Expected Results . . . . . . . . . . . . . . . . . . . . . . . 1-4

2. Set up the Optimetrics DesignSave the Tee Project Under a New Name . . . . 2-2 Delete the Frequency Sweep . . . . . . . . . . . . . . 2-2

3. Set up and Solve the Parametric AnalysisAdd a Parametric Setup . . . . . . . . . . . . . . . . . . . 3-2Add a Variable Sweep Definition . . . . . . . . . . . 3-3 Save Fields and Mesh for Every Solved Design Variation . . . . . . . . . . . . . . . . . . . . . . . 3-4 Specify the Solution Quantities to Evaluate . . 3-5

Solve the Parametric Analysis . . . . . . . . . . . . . . 3-8

4. Review the Parametric ResultsPlot of S-Parameter Results vs. Offset Position 4-2 Plot of Power Distribution vs. Offset Position . . 4-4Contents-1

Getting Started with Optimetrics: Optimizing a Waveguide T-Junc-

Animate the Field Overlay Plot . . . . . . . . . . . . . 4-6

5. Set up and Solve the Optimization AnalysisSelect the Variable to be Optimized . . . . . . . . . 5-2 Add an Optimization Setup . . . . . . . . . . . . . . . . 5-2Add a Cost Function . . . . . . . . . . . . . . . . . . . . Modify the Variables Starting Value . . . . . . . . Modify the Variables Minimum and Maximum Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solve the Parametric Setup Before the Optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . Update the Variable Value After Optimization Clear the Save Fields and Mesh Option . . . . . 5-4 5-6 5-6 5-7 5-7 5-7

Solve the Optimization Analysis . . . . . . . . . . . . 5-8

6. Review the Optimization ResultsView the Cost vs. Solved Iteration . . . . . . . . . . . Re-analyze the Design at the Septums Optimal Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Update the Field Overlay Plot . . . . . . . . . . . . . . Close the Project and Exit HFSS . . . . . . . . . . . . 6-2 6-4 6-4 6-5

Contents-2

1

Introduction

Estimated time to complete this guide: 45 minutes.

This Getting Started guide is written for Optimetrics beginners as well as experienced users who are using Optimetrics version 6 for the first time. You must have completed Getting Started with HFSS: A Waveguide T-Junction before you begin this guide. The parametric and optimization setups you create are based on the design setup, analyses, and post processing completed in the Getting Started with HFSS guide. By following the steps in this guide, you will learn how to perform the following tasks: Create a basic parametric setup. Solve a parametric analysis. Create a 2D x-y plot of S-parameter results. Create a 2D x-y plot of power distribution results. Create a geometry animation. Specify a variable to be optimized. Create an optimization setup, which includes defining a cost function and setting the range of variable values for an optimization. Solve an optimization analysis. During an optimization analysis, view a plot of cost values versus solved iterations. Run an HFSS simulation using the optimal variable value. Update an existing field overlay plot with new results.Introduction 1-1

Getting Started with Optimetrics: Optimizing a Waveguide T-Junction

Using Optimetrics with HFSSOptimetrics enables you to determine the best design variation among a designs possible variations. You create the original model, the nominal design, and then define the design parameters that vary. These can be nearly any design parameter assigned a numeric value in HFSS. For example, you can parameterize the model geometry, material properties, or boundary conditions. You can then perform the following types of analyses on your nominal design: Parametric You define one or more variable sweep definitions, each specifying a series of variable values within a range, and HFSS solves the design at each variation. You identify the cost function and the optimization goal. Optimetrics changes the design parameter values to meet that goal. Optimetrics explores the vicinity of the design point to determine the sensitivity of the design to small changes in variables. Variable values are changed interactively and the performance of the design is monitored. Optimetrics determines the distribution of a design's performance, which is caused by a statistical distribution of variable values.

See the online help about the specific parameter you want to vary to determine if it can be assigned a variable.

Optimization

Sensitivity

Tuning Statistical

In this Getting Started guide, you will perform a parametric analysis and an optimization analysis.

1-2 Introduction

Getting Started with Optimetrics: Optimizing a Waveguide T-Junction

About the Nominal DesignIn Getting Started with HFSS: A Waveguide T-Junction, you created a T-shaped waveguide with an inductive septum. 1 A signal at a frequency of 10 GHz entered the waveguide at Port 1 (see below) and exited at Port 2 and Port 3. Septum

Port 2

Port 3

Port 1

The waveguides transmiss