Ansys High-Frequency Electromagnetic Analysis Guide.pdf

ANSYS High-Frequency

Electromagnetic

Analysis Guide

ANSYS Release 9.0

002114

November 2004

ANSYS, Inc. is a

UL registered

ISO 9001: 2000

Company.

ANSYS High-Frequency

Electromagnetic Analysis Guide

ANSYS Release 9.0

ANSYS, Inc.

Southpointe

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Canonsburg, PA 15317

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Table of Contents

1. Overview of High-Frequency Electromagnetic Analysis .................................................................... 1–1

2. Finite Element Analysis of High-Frequency Electromagnetic Fields .................................................. 2–1

3. Elements Available in High-Frequency Electromagnetic Analysis ..................................................... 3–1

4. Performing a High-Frequency Harmonic Analysis .............................................................................. 4–1

4.1. Creating the Physics Environment ................................................................................................. 4–2

4.1.1. Specifying Element Types ..................................................................................................... 4–2

4.1.2. Specifying the System of Units ............................................................................................. 4–3

4.1.3. Specifying Material Properties .............................................................................................. 4–3

4.2. Building the Model, Assigning Region Attributes, and Meshing ...................................................... 4–4

4.2.1. Defining Model Region Attributes ........................................................................................ 4–4

4.2.2. Meshing the Model .............................................................................................................. 4–4

4.3. Applying Boundary Conditions and Excitations (Loads) ................................................................. 4–5

4.3.1. Applying Boundary Conditions ............................................................................................. 4–5

4.3.1.1. Perfect Electric Conductor (PEC) ................................................................................... 4–6

4.3.1.2. Perfect Magnetic Conductor (PMC) .............................................................................. 4–7

4.3.1.3. Surface Impedance ...................................................................................................... 4–7

4.3.1.4. Perfectly Matched Layers (PML) ................................................................................... 4–9

4.3.1.5. Periodic Boundary Conditions .................................................................................... 4–12

4.3.2. Applying Excitation Sources ............................................................................................... 4–15

4.3.2.1. Excitation Port ........................................................................................................... 4–16

4.3.2.2. Current Source .......................................................................................................... 4–21

4.3.2.3. Plane Wave Source .................................................................................................... 4–23

4.3.2.4. Surface Magnetic Field Source ................................................................................... 4–23

4.3.2.5. Electric Field Source ................................................................................................... 4–24

4.3.2.6. Equivalent Source Surface ......................................................................................... 4–25

4.3.2.7. Lumped Circuits ........................................................................................................ 4–26

4.4. Solving Harmonic High-Frequency Analyses ................................................................................ 4–28

4.4.1. Defining the Analysis Type ................................................................................................. 4–28

4.4.2. Defining Analysis Options and Estimating Computer Resources .......................................... 4–28

4.4.3. Setting the Analysis Frequencies ........................................................................................ 4–29

4.4.4. Defining a Scattering Analysis ............................................................................................ 4–29

4.4.5. Defining a Radiation Analysis for a Phased Array Antenna ................................................... 4–29

4.4.6. Starting the Solution .......................................................................................................... 4–29

4.4.7. Finishing the Solution ........................................................................................................ 4–32

4.5. Postprocessing Harmonic High-Frequency Analyses .................................................................... 4–32

4.5.1. Reviewing Results .............................................................................................................. 4–32

4.5.2. Commands to Help You in Postprocessing .......................................................................... 4–33

4.5.3. Calculating Near Fields, Far Fields, and Far Field Parameters ................................................ 4–34

4.5.3.1. Near Fields ................................................................................................................ 4–34

4.5.3.2. Far Fields and Far Field Parameters ............................................................................ 4–35

4.5.3.3. Symmetry .................................................................................................................. 4–36

4.5.3.4. Radiation Solid Angle ................................................................................................ 4–37

4.5.4. Calculating Circuit Parameters for High-Frequency Devices ................................................. 4–38

4.5.4.1. Scattering Parameters (S-Parameters) ........................................................................ 4–38

4.5.4.2. Reflection Coefficients in a COAX Fed Device ............................................................. 4–39

4.5.4.3. Power and Frequency Selective Surface Parameters ................................................... 4–39

4.5.4.4. Voltage, Current, and Impedance ............................................................................... 4–39

4.5.4.5. Smith Chart and Network Parameter Conversion ........................................................ 4–41

5. Performing a Modal High-Frequency Analysis ................................................................................... 5–1

5.1. Entering the SOLUTION Processor and Specifying the Modal Analysis Type .................................... 5–2

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