HFSS设计实例OptimTee

HFSS v9 0 HFSS v9 0 with Optimetricswith Optimetrics Getting Started with Optimetrics Optimizing a Waveguide T Junction Using HFSS and Optimetrics Getting Started with Optimetrics Optimizing a Waveguide T Junction Using HFSS and Optimetrics May 2003 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 perfor mance or use of this material 2003 Ansoft Corporation All rights reserved Ansoft Corporation Four Station Square Suite 200 Pittsburgh PA 15219 USA Phone 412 261 3200 Fax 412 471 9427 HFSS and Optimetrics are registered trademarks or trademarks of Ansoft Corpo ration All other trademarks are the property of their respective owners New editions of this manual will incorporate all material updated since the pre vious edition The manual printing date which indicates the manual s 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 EditionDate Software Version 1May 2003Optimetrics 3 0 HFSS 9 0 Getting Started with Optimetrics Optimizing a Waveguide T Junction iii Conventions Used in this GuideConventions Used in this Guide Please take a moment to review how instructions and other useful infor mation 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 car ats 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 Alternate methods or tips are listed in the left margin in blue italic text iv Getting Started with Optimetrics Optimizing a Waveguide T Junction Getting HelpGetting Help Ansoft Technical SupportAnsoft Technical Support To contact Ansoft technical support staff in your geographical area please log on to the Ansoft corporate website click the Contact button and then click Support You will find phone numbers and e mail addresses for the technical support staff Your Ansoft account manager may also be contacted 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 spe cific information about what steps were taken or what stages the simula tion reached This allows more rapid and effective debugging Context Sensitive HelpContext Sensitive Help To access online help from the HFSS user interface do one of the follow ing 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 dia log box and then press F1 Contents 1 Table of Contents 1 Introduction1 Introduction Using Optimetrics with HFSS 1 2 About the Nominal Design 1 3 Using Optimetrics to Improve the T Junction Design 1 4 Expected Results 1 4 2 Set up the Optimetrics Design2 Set up the Optimetrics Design Save the Tee Project Under a New Name 2 2 Delete the Frequency Sweep 2 2 3 Set up and Solve the Parametric Analysis3 Set up and Solve the Parametric Analysis Add a Parametric Setup 3 2 Add a Variable Sweep Definition 3 3 Save Fields for Every Solved Design Variation 3 4 Specify the Solution Quantities to Evaluate 3 5 Solve the Parametric Analysis 3 7 4 Review the Parametric Results4 Review the Parametric Results Create a Rectangular Plot of S Parameter Results vs Offset Position 4 2 Create a Rectangular Plot of Power Distribution vs Offset Position 4 4 Getting Started with Optimetrics Optimizing a Waveguide T Junction Using HFSS and Optimetrics Contents 2 Animate the Field Overlay Plot 4 6 5 Set up and Solve the Optimization Analysis5 Set up and Solve the Optimization Analysis Select the Variable to be Optimized 5 2 Add an Optimization Setup 5 2 Add a Cost Function 5 3 Modify the Variable s Starting Value 5 4 Modify the Variable s Minimum and Maximum Values 5 4 Choose to Solve the Parametric Setup Before the Optimization 5 5 Choose to Update the Variable Value After Optimization 5 5 Solve the Optimization Analysis 5 6 6 Review the Optimization Results6 Review the Optimization Results View the Cost vs Solved Iteration 6 2 Re analyze the Design at the Septum s Optimal Value 6 3 Update the Field Overlay Plot 6 3 Close the Project and Exit HFSS 6 4 Introduction 1 1 1Introduction This Getting Started guide is written for Optimetrics beginners as well as experienced users who are using Optimetrics version 3 for the first time You must have completed Getting Started with HFSS A Waveguide T Junction before you begin this guide The parametric and optimiza tion setups you will create are based on the design setup analyses and post processing completed in the HFSS Getting Started 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 optimiza tion 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 Estimated time to complete this guide 45 minutes Getting Started with Optimetrics Optimizing a Waveguide T Junction 1 2 Introduction Using Optimetrics with HFSSUsing Optimetrics with HFSS Optimetrics enables you to determine the best design variation among a design s possible variations You create the original model the nominal design and then define the design parameters that vary which can be nearly any design parameter assigned a numeric value in HFSS For exam ple you can parameterize the model geometry material properties or boundary conditions You can then perform the following types of analy ses on your nominal design In this Getting Started guide you will perform a parametric analysis and an optimization analysis ParametricYou 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 OptimizationYou identify the cost function and the optimization goal Optimetrics changes the design parameter values to meet that goal SensitivityOptimetrics explores the vicinity of the design point to determine the sensitivity of the design to small changes in variables TuningVariable values are changed interactively and the performance of the design is monitored StatisticalOptimetrics 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 Getting Started with Optimetrics Optimizing a Waveguide T Junction Introduction 1 3 About the Nominal DesignAbout the Nominal Design In 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 The waveguide s transmission and reflection of the signal depended on the position of the septum You assigned a variable to the septum s posi tion named offset and solved the design at two values of offset When the septum was located centrally opposite to Port 1 offset was 0 inches the septum divided the signal and directed it evenly towards the output ports Port 2 and Port 3 When the septum was moved 0 2 inches closer to Port 2 offset was 0 2 inches the transmission through Port 2 decreased and the transmission through Port 3 increased 1 Parametrics and Optimization Using Ansoft HFSS Microwave Journal Product Reviews November 1999 Port 1 Septum Port 2 Port 3 Getting Started with Optimetrics Optimizing a Waveguide T Junction 1 4 Introduction Using Optimetrics to Improve the T Junction Design Using Optimetrics to Improve the T Junction Design In this Getting Started guide you will use Ansoft s Optimetrics software to find an optimal position for the septum For this guide the optimal position will be defined as the one that results in the power distribution at Port 3 being twice the power distribution at Port 2 In Optimetrics this desired result is called the cost function Optimetrics will search for and solve different design variations until the minimum cost is achieved Prior to performing the optimization you will set up and solve a para metric analysis The parametric setup will define a range of values for the variable offset During the parametric analysis Optimetrics will solve the design at each variation You will compare the results to deter mine how each design variation affects the S parameters and power dis tribution within the structure These results will help to determine a reasonable range of offset values to specify for the optimization analy sis The results will also help Optimetrics determine an acceptable start ing point for the optimization analysis Expected ResultsExpected Results The HFSS analysis you ran in Getting Started with HFSS A Waveguide T Junction showed that when the septum is located centrally opposite to Port 1 it directs the signal evenly towards the output ports Port 2 and Port 3 The parametric analysis is expected to show that as the septum moves closer toward Port 2 the transmission and power distribution will initially decrease at Port 2 and increase at Port 3 As the septum contin ues to move closer toward Port 2 the signal should begin to bounce off of the T junction wall opposite Port1 more of the signal will be reflected and the performance of the structure will degrade To determine if the parametric results are as expected you will compare HFSS s S parameter calculations at each septum position on a 2D x y plot You will create a second x y plot that compares the power distribu tion at each port as the septum changes position You will also create an animated field plot on the model geometry which will indicate if the field pattern changes as expected with the septum s position This parametric analysis post processing will provide useful information for setting up the optimization analysis that follows For example it should reveal the septum position that will most likely result in the power distribution at Port 3 being twice that at Port 2 It will also narrow the range of variable values you will set for the optimization The cost function can be based on any solu tion quantity that HFSS can compute such as field values S parameters and eigenmode data Getting Started with Optimetrics Optimizing a Waveguide T Junction Introduction 1 5 The optimization analysis is expected to find an optimal septum position between 0 and 0 2 inches You will re analyze the design at the optimal position and then update the field overlay plot you created in the ear lier HFSS Getting Started guide The E field values should indicate that the fields are twice as great moving toward Port 3 as they are moving toward Port 2 Getting Started with Optimetrics Optimizing a Waveguide T Junction 1 6 Introduction Set up the Optimetrics Design 2 1 2Set up the Optimetrics Design In this chapter you will complete the following tasks Open the project Tee hfss and save it with a different name Delete the sweep setup Estimated time to complete this chapter 2 minutes Getting Started with Optimetrics Optimizing a Waveguide T Junction 2 2 Set up the Optimetrics Design Save the Tee Project Under a New NameSave the Tee Project Under a New Name Open the project Tee hfss and save it with a new name 1 On the File menu click Open 2 Use the file browser to locate the project Tee hfss and then click the project name 3 Click Open The design appears in the 3D Modeler window and the design infor mation and material definitions are listed in the project tree 4 On the File menu click Save As 5 Use the file browser to locate the directory in which you want to save the project 6 Type OptimTee in the File name text box and then click Save The project is saved in the directory you selected by the file name OptimTee hfss Delete the Frequency SweepDelete the Frequency Sweep When you solve the parametric and optimization analyses later in this guide you will solve at the solution frequency you specified in the Solu tion Setup dialog box 10 GHz Solving across a range of frequencies for each design variation is not necessary so delete the frequency sweep setup It is listed in the project tree under Analysis Setup1 Click Sweep1 in the project tree and then press Delete Now you are ready to set up the parametric analysis Save your project fre quently Click SaveSave on the FileFile menu Set up and Solve the Parametric Analysis 3 1 3Set up and Solve the Parametric Analysis In this chapter you will complete the following tasks Add a parametric setup to the project Add a variable sweep definition to the parametric setup Solve the parametric analysis Estimated time to complete this chapter not including solution time 10 minutes Getting Started with Optimetrics Optimizing a Waveguide T Junction 3 2 Set up and Solve the Parametric Analysis Add a Parametric SetupAdd a Parametric Setup A parametric setup specifies all of the design variations that Optimetrics will drive HFSS to solve A parametric setup is made up of one or more variable sweep definitions each specifying a set of variable values within a range that you want HFSS to solve when you run the parametric setup First add the parametric setup to the project Right click Optimetrics in the project tree and then click Add Parametric on the shortcut menu The Setup Sweep Analysis dialog box appears Next add a variable sweep definition to the parametric setup Getting Started with Optimetrics Optimizing a Waveguide T Junction Set up and Solve the Parametric Analysis 3 3 Add a Variable Sweep DefinitionAdd a Variable Sweep Definition 1 Under the Sweep Definitions tab click Add The Add Edit Sweep dialog box appears 2 offset is listed in the Variable pull down list by default This is the variable for which you are defining the sweep definition 3 Select Linear step as the sweep type 4 In the Start box type 0 and then select in 5 In the Stop box type 1 and then select in 6 In the Step box type 0 1 and then select in The step size determines the number of design variations between the start and stop values HFSS will solve the model at each step in the specified range including the start and stop values 7 Click Add The dialog box looks like the following 8 Click OK You return to the Setup Sweep Analysis dialog box A Linear StepLinear Step sweep type enables you to specify a linear range of values with a constant step size Getting Started with Optimetrics Optimizing a Waveguide T Junction 3 4 Set up and Solve the Parametric Analysis The sweep definition is listed in the top half of the window Save Fields for Every Solved Design VariationSave Fields for Every Solved Design Variation By default HFSS does not save field solution data for every solved design variation in a parametric setup You will want those field solutions avail able for post processing so do the following Under the General tab select Save Fields For more information about the other options in the Setup Sweep Analysis Setup Sweep Analysis dialog box see the online help View the design variations that will be solved in table format under the TableTable tab This enables you to visualize the design variations that will be solved and manually adjust sweep points if necessary Getting Started with Optimetrics Optimizing a Waveguide T Junction Set up and Solve the Parametric Analysis 3 5 Specify the Solution Quantities to EvaluateSpecify the Solution Quantities to Evaluate Now you will identify 3 solution quantities that will be of interest during post processing HFSS will extract the solution quantities from the solu tion and make them available during post processing You will create 3 output variables that represent the mathematical expressions for the power distribution quantities at Port 1 Port 2 and Port 3 1 Under the Calculations tab click Add By default the solution quantity will be extracted from the last adap tive solution generated for the solution setup 2 Click Edit Calculation The Output Variables dialog box appears 3 De