MICROWAVE CAD TOOLSGroup Members :

SUMEET .S. NESARIKAR(2GI08EC105)SUPRIYA .C. KAGI(2GI08EC106)

SUPRIYA DESHPANDE(2GI08EC107)

SEMINAR GUIDE: Proff. D .A. Torse

Contents

Introduction to CAD tools Introduction to IE3D software Implementation of IE3D

Introduction

CAD stands for Computer Aided Design Microwave CAD software’s are software's that

use computer technology to aid in the design, modeling, and simulation of an microwave product.

There are many microwave CAD tools available till date.

Two of such important microwave CAD software’s are: IE3D MICROWAVE STUDIO

IE3D

INTRODUCTION: IE3D from Mentor Graphics, formerly Zeland Software is

the first SCALABLE EM design and verification platform that delivers the modeling accuracy for the combined needs of high-frequency circuit design and signal integrity engineers across multiple design domains.

IE3D is an integral equation and method of moment based EM simulator.

IE3D mainly focuses on general planar and 3D metallic structures in layered dielectric environments. It is extremely efficient, accurate and flexible for such structures.

IE3D can also model full 3D dielectric structures such as patch antennas with finite substrates and dielectric resonator antennas.

IE3D is not just a simulation tool but also a design tool. It can do real-time EM tuning and optimization.

Implementation of IE3D

Ie3d for antennas We use polygons to describe the shape of an

antenna or a circuit. Two terminals are involved in a port. However,

you may only need to define one terminal for a port when you have an infinite ground plane serving as the reference automatically.

Double precision floating point numbers are used to describe polygon vertices. We can model arbitrarily shaped structures precisely on IE3D. There is no need to snap the vertices or the meshing to grids.

Two polygons are considered to be electrically connected only when they have one or more common edges.

Overlapped polygons are not considered connected. In case multiple polygons are overlapped. IE3D will automatically detect them. It will allow you to clean them optionally. In case you do not clean them on the layout editor, they will be cleaned automatically on the simulation engine.

a ab bb

c cc

d d

1

6

2

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5

1 2

34

1 2

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Polygons (a,b,c,d) and (1,2,3,4) are not connected because of no common edge

Polygons (a,b,c,d) and (1,2,3,4,5,6) are connected because of common edge (b,c) or (5,6)

Polygons (a,b,c,d) and (1,2,3,4) are not connected even they are overlapped

Major editing window is the top view and drawing is on layers.

A 3D polygon can be entered with some vertices on one layer and some vertices on other layers.

Please understand that there are two layer systems on IE3D: (1) substrate layers defined in Basic Parameters. They are very critical because they are part of the structure. (2) metallic layers on the Layer Window on the right of the layout editor. They are not critical. They are just for geometry editing only.

Many advanced editing commands allowing users to create and edit complicated planar and 3D geometry shapes.

1 32 1

3

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Mouse driven editing on top view3D View for display and 3D polygons entered as vertices on different layers

Major Application ProgramsMGRID Layout editor, s-parameters post-processor, current distribution and near field post

processor. It is the major GUI program of the package. It will be renamed as IE3D EM Design System in IE3D V14 with a fully integrated environment.

IE3DLIBRARY It is the 2nd layout editor with high level geometry parameterization and Boolean operations. You can use it for tuning of optimization of very complicated structures such as an elliptical patch with a circular hole with varying dimensions etc.

AGIF It is the 3rd layout editor. In fact, it is not for you to edit geometry. It is more for you to create full-3D IE3D geometry including wire bonds, vias, thick metal, solder balls and ports directly from layered polygons in standard industrial formats (GDSII etc.).

PATTERNVIEW Display, comparison and processing of radiation patterns and pattern related parameters.

IE3DOS IE3D simulation engine doing the number crunching. It is automatically called by other programs such as MGRID, AGIF, etc. Users can’t see it from the desktop. You can only see it from Task Manager while you are running an IE3D simulation.

MDSPICE It is the optional mixed frequency and time domain circuit simulator. It can take RLC and s-parameters as elements for circuit simulation.

ADIX IE3DGDSIIDXFACISGERBER converter (available on IE3D MM08x and optional on other editions).

LINEGAUGE An optional simple transmission line calculator (Basic edition free)

ZDS/ZDM Network based distributed IE3D simulation and optimization service allowing multi-frequency simulation or optimization to be distributed into the whole network.

Jobs Manager It is manager for local and network distributed IE3D simulations. It has replaced the Zeland Simulation Queue for scheduled and batch IE3D and FIDELITY EM simulations.

Layout and Geometry Tools

MGRID: Polygon based geometry editing with great flexibility in general shapes and details. Limited parameterization. The base of IE3D layout and geometry editing.

IE3DLIBRARY: Library based layout tool. Easy for parameterization.

AGIF: Automatic links to GDSII, Cadence Virtuoso, Allegro and APD

Polygon Based Layout Editor Configuration

Top View Window for Editing

Metallic or polygon Layer window for the polygon layers

Status window for the current editing mode

Information bar for additional information

Polygon Layout Editor Menu System

Major Menu Functionality

Edit Some simple editing commands for polygons and vertices.

Param Change and setup of basic parameters and optional parameters. Basic parameters including substrates (top and bottom grounds), metallic types, enclosures, geometry entry grid sizes, finite dielectrics properties. Optional parameters control the default setups for geometry editing, simulation accuracy and efficiency.

Input Handling vertex entry and manipulation.

Adv Edit More and advanced editing features for polygons and vertices.

Entity Creation of pre-defined objects as polygons in one shot

Port Define and edit ports.

Optim Define and edit optimization variables for EM optimization and tuning.

Process Meshing, simulation and optimization setup, invoking other applications for displaying s-parameters, current distribution and patterns.

View Setup the 2D and 3D views.

Help Accessing online help and the IE3D User’s Manual with indexed vocabulary.

Major Editing Modes Polygon Handling:

Mode Command Function

Draw Edit->Draw Allow drawing vertices and polygons using mouse and keyboard

Select Polygon Edit->Select Polygon Allow selecting a polygon by clicking at it.

Select Polygon Group Edit->Select Polygon Group

Allow selecting a group of polygons by windowing them.

Select Vertices Edit->Select Vertices Allow selecting a group of vertices by windowing them.

No Entry When above commands unchecked

Allow no mouse entry

Draw

Select Polygon Select Polygon Group

Select Vertices

More Comments on Drawing and Selections

Drawing: You can use mouse to draw a series vertices:

Close the vertices for a polygon. Adv Edit->Build Path for building a path (final results in polygons). Adv Edit->Build Wire Path for building a tube like wire (final results

in polygons). Most related commands for drawing vertices are in the Input

menu. Select Polygon and Select Polygon Group Modes:

You can select some polygons and do geometry modeling on them.

Most related commands are in the Edit and Adv Edit menus.

Select Vertices Mode: You can select some vertices and move them to change

the shape of a geometry. Most related commands are in the Edit and Adv Edit

menus. No Specific Select Edge Mode:

To select an edge, you should select the 2 vertices of an edge in Select Vertices mode.

Drawing and Selection Modes Based Upon Layers: Please pay special attention to the Layer Window.

Major Editing Modes

Different Kinds of Commands Convenient for Different Kinds of Ports:Mode Command Functionality

Define Port Port->Define Port Define a port by clicking at an edge on the current editing layer.

Port for Edge Group

Port->Port for Edge Groups

Define a port by windowing a group of linked edges on different checked layers. A 3D edge is selected if the 3D polygon layer is checked and all the layers its vertices on are checked.

Select Polygon or Select

Polygon Group

Port->Selected Rectangles for

Horizontal Localized Port

Define a group of connected horizontal rectangles (not necessary to be completely horizontal with constant Z) as a horizontal localized port

Select Vertices Port->Selected Edges for Extension Port

Define an extension port on a group of selected edges. An edge is considered to be selected if both its vertices are selected. The selected edges must be linked. They can’t be separated from each other. The layout editor will build necessary polygons.

Select Polygon or Select

Polygon Group

Port->Selected Rectangles for Vertical

Localized Ports

Define a group of connected vertical rectangles as a vertical localized port.

Select Vertices Port->Selected Edges for Horizontal Localized

Port

Define a horizontal localized port between two groups of selected edges. The layout editor will build necessary polygons for the port

Define Port

Port for Edge Group Selected Rectangles for Horizontal Localized Port

APPLICATIONS OF IE3D

Microwave circuits and MMIC. RF circuits, LTCC circuits and RFIC. Microwave, RF and wireless antennas. RFID tag antennas. HTS filters. Printed Circuit Boards. Electronic packaging and signal integrity. EMC and EMI. Many other low to high frequency structures.

Microwave studio

MICROWAVE STUDIO (CST MWS) is a specialist tool for the 3D EM simulation of high frequency components. CST MWS' unparalleled performance making it first choice in technology leading R&D departments.

CST MWS enables the fast and accurate analysis of high frequency (HF) devices such as antennas, filters, couplers, planar and multi-layer structures and SI and EMC effects. Exceptionally user friendly, CST MWS quickly gives you an insight into the EM behavior of your high frequency designs.

MICROWAVE STUDIO

CST promotes Complete Technology for 3D EM. Users of our software are given great flexibility in tackling a wide application range through the variety of available solver technologies

CST MICROWAVE STUDIO is seen by an increasing number of engineers as an industry standard development tool.

Applications of microwave studio Microwave studio is used in Patch antenna

design.

Conclusion

IE3D is a very capable EM simulation and Optimization package for both 2.5D and 3D antenna modeling.

Its accuracy and efficiency are proven by wide range industrial verifications.

The geometry modeling is extremely capable and we can not demonstrate all of them in this course note. Interested users should try to explore it from the user’s manual and using the software.

More information can be found in the Zeland Virtual Training on the web-site.

Full functional free evaluation license is available on the web site.

THANK YOU