CST Microwave Studio Tutorials.pdf

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CST MICROWAVE STUDIO ® 3 D E M F O R H I G H F R E Q U E N C I E S TUTORIALS C S T S T U D I O S U I T E ™ 2 0 0 6

Copyright © 1998-2005 CST GmbH–Computer Simulation Technology All rights reserved. Information in this document is subject to change without notice. The software described in this document is furnished under a license agreement or non-disclosure agreement. The software may be used only in accordance with the terms of those agreements. No part of this documentation may be reproduced, stored in a retrieval system, or transmitted in any form or any means electronic or mechanical, including photocopying and recording for any purpose other than the purchaser’s personal use without the written permission of CST. Trademarks CST MICROWAVE STUDIO,CST DESIGN ENVIRONMENT, CST EM STUDIO, CST PARTICLE STUDIO, CST DESIGN STUDIO are trademarks or registered trademarks of CST GmbH. Other brands and their products are trademarks or registered trademarks of their respective holders and should be noted as such. CST–Computer Simulation Technology www.cst.com

CST MICROWAVE STUDIO® Tutorials Rectangular Waveguide Tutorial Coaxial Structure Tutorial Planar Device Tutorial Antenna Tutorial Resonator Tutorial Filter Tutorial 10/04/2005 3 31 77 115 165 193

Rectangular Waveguide Tutorial Geometric Construction and Solver Settings Introduction and Model Dimensions Geometric Construction Steps Calculation of Fields and S-Parameters Transient Solver Transient Solver Results Accuracy Considerations Frequency Domain Solver Frequency Domain Solver Results Accuracy Considerations Getting More Information 4 4 5 14 14 15 19 22 25 29 30

CST MICROWAVE STUDIO® 2006 – Rectangular Waveguide Tutorial 4 Geometric Construction and Solver Settings Introduction and Model Dimensions In this tutorial you will learn how to simulate rectangular waveguide devices. As a typical example for a rectangular waveguide, you will analyze a well-known and commonly used high frequency device: the Magic Tee. The acquired knowledge of how to model and analyze this device can also be applied to other devices containing rectangular waveguides. The main idea behind the Magic Tee is to combine a TE and a TM waveguide splitter (see the figure below for an illustration and the dimensions). Although CST MICROWAVE STUDIO® can provide a wide variety of results, this tutorial concentrates solely on the S-parameters and electric fields. In this particular case, port 1 and port 4 are de-coupled, so one can expect S14 and S41 to be very small. We strongly suggest that you carefully read through the CST MICROWAVE STUDIO® Getting Started manual before starting this tutorial.

CST MICROWAVE STUDIO® 2006 – Rectangular Waveguide Tutorial 5 Geometric Construction Steps Select a Template After you have started CST DESIGN ENVIRONMENT™ and have chosen to create a new CST MICROWAVE STUDIO® project, you are requested to select a template that best fits your current device. Here, the “Waveguide Coupler” template should be selected. This template automatically sets the units to mm and GHz, the background material to PEC (which is the default) and all boundaries to be perfect electrical conductors. Because the background material (that will automatically enclose the model) is specified as being a perfect electrical conductor, you only need to model the air-filled parts of the waveguide device. In the case of the Magic Tee, a combination of three bricks is sufficient to describe the entire device. Define Working Plane Properties Usually, the next step is to set the working plane properties in order to make the drawing plane large enough for your device. Because the structure has a maximum extension of 100 mm along a coordinate direction, the working plane size should be set to at least 100 mm. These settings can be changed in a dialog box that opens after selecting Edit Working Plane Properties from the main menu. Please note that we will use the same document conventions here as introduced in the Getting Started manual.

6 CST MICROWAVE STUDIO® 2006 – Rectangular Waveguide Tutorial Change the settings in the working plane properties window to the values given above before pressing the OK button. Define the First Brick or selecting Now you can create the first brick: This is most easily accomplished by clicking the “Create brick” icon Objects Basic Shapes Brick from the main menu. CST MICROWAVE STUDIO® now asks you for the first point of the brick. The current coordinates of the mouse pointer are shown in the bottom right corner of the drawing window in an information box. After you double-click on the point x=50 and y=10, the information box will show the current mouse pointer’s coordinates and the distance (DX and DY) to the previously picked position. Drag the rectangle to the size DX=-100 and DY=-20 before double-clicking to fix the dimensions. CST MICROWAVE STUDIO® now switches to the height mode. Drag the height to h=50 and double-click to finish the construction. You should now see both the brick, shown as a transparent model, and a dialog box, where your input parameters are shown. If you have made a mistake during the mouse based input phase, you can correct it by editing the numerical values. Create the brick with the default component and material settings by pressing the OK button. Your brick’s mouse-based input parameters are summarized in the table below. Xmin Xmax Ymin Ymax Zmin Zmax -50 50 -10 10 0 50

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