CAE Coureware

The exe program is converted from Python + VPython programs. It's free. Only for educational use.
You are responsibile for the copyright of the libraries used in the software.

Then double click the exe file: zqyuncaeprogs.exe and select a program to play with.

Created by Zhengqing Yun.

Contents

### 1. Types of Waves

Instructions
Transverse Wave

Longitudinal Wave

Water Wave

Instructions

### 3. Snell's Law: Reference Directions

The program starts with an interface and a normal vector. Then a left button click
will introduce an incident direction (red arrow). Press 'v' key to turn on/off the plane of
incidence. Now you can use 'Up', 'Down', 'Left', and 'Right' keys to change the
incident direction. You can leave this interactive loop by pressing the 'e' key.
The program will display a 3D scene as follows:

• To change the incident direction: Drag the green sphere
• To assign an incident electric field vector: Click on the yellow wavefront with the incident wave.
• To decompose the electric field vector into parallel and perpendicular components: Press the 'p' key.
• You can turn on/off the e-field vector, the wavefronts by pressing keys: 'I','i','r','t'

### 4. Oblique Incidence on PEC: Total Field

• Drag the green sphere to change incident angle;
• Press the 'x','y','z' key to show/hide x-, y-, z-components (yellow, green, pink arrows);
• Press the 'p' key to show/hide parallel component, Ex+Ez (white arrows);
• Press the 'Up', 'Down' arrow keys to make the field vectors larger, smaller (for visualization purposes);
• Press the '0' key to set t = 0.

Instructions

Instructions

### 8. Polarization

• To get linear, circular, and elliptical polarizations:
• Drag the three spheres to change Ex, Ey magnitudes and the phase Ey leads Ex, Phi
• Press the 'i' key to enter the exact values of Ex, Ey and Phi (Ex and Ey are normalized to their max)
• In 3D mode, press 'x', 'y', and 't' keys to view/hide the Ex, Ey, and total field curves
• 2D mode (default or by press the '2' key to enter):

• 3D mode (press the '3' key to enter):

### 9. Linear Antenna: 2D Radiation Pattern

Use the Up/Down keys to change the antenna length (in wavelengths).

### 10. Linear Antenna: 3D Radiation Pattern

To change antenna length (in wavelengths):
• Drag the top red sphere;
• Use the Up/Down keys;
• Press 'k' key to enter 2L
Press '3' key to get 3D pattern; press '4' to cancel.

### 11. Array factor: graphical method

Graphically obtain array factor in polar form from universal curve

### 12. Law of Diffraction

Using Keller's law of diffraction to determine diffracted ray

### 13. Local coordinates for diffraction

Drag Tx or Rx to view the change of the diffraction point and the field directions

### 14. FDTD Grid: 3D visualization

Simply click and click to build a FDTD grid step by step.

### 15. Interactive Smith Chart

It's a basic Smith Chart, not so fancy.

A PDF file for a fancy Smith Chart can be downloaded here.
It is generated with my Python+Matplotlib program and looks like this:

### 16. Propagation in a 2D Hallway

(f=2.4 GHz; side wall eps_r=3.0)
• Enter maximum number of reflections at the beginning (0 for free space).
• Drag Rx (green) to get the received power along a line.
• Drag Tx (red) along y-axis to change its location.

### 16. Skylight Polarization

Explains sky light polarization using Rayleight scattering patterns

### 18. Thin Lens

Drag the object arrow and focal point to interact.