animation program to show travelling wave

BARRON_MANNY@Tandem.COM
22 Apr 97 14:02:00 -0700

Here's a summary of an inexpensive simulation software package that I
purchased a few months ago at a local technical bookstore. It cost
about $45 and wow it works great! Actually the simulation software
focuses on various topics of physics, but since transmission line theory
is part of the physics curriculum maybe the same people market a
transmission line simiulation package. You'll have to check on that,
but here's the scoop.

The particular simulation package I purchased covers 'Electricity and
Magnetism' and consists of various simulations in this field. There is
a particular simulation in this package (that leads me to believe they
may also have one on transmission line theory) that covers the
interaction of electromagnetic plane waves at a two-medium boundary.
This simulation runs on an MS-DOS based operating system and is fully
animated in color and has lots of 'user-friendly' controls that are
easily implemented to change various parameters of the simulation, for
example the permitivity, permeability, and conductivity of the medium.
You can view in slow-motion, fast-motion, or step-motion and see the
sinusoidal orthogonal E and H fields in the plane waves as they impinge
on the medium boundary. You can actually watch as the wave absorbs
and/or reflects at the boundary interface and even see the 'constructive
interfernce' amplitude increase of the reflected wave. You can rotate
your viewing position [real-time while the simulation is running] to ANY
orientation by simply tapping the arrow keys. There are many more
features that I don't have time to discuss, but it's neatj and very
professionally done. There's also another module that does a simulation
of the electromagetic field of a moving charge, i.e., 'electromagnetic
radiation'. The program is excellent and well worth the small
investment.

This software package is actually a book with floppy disk included, and
is titled "Electricity and Magnetism Simulations - The consortium for
Upper-Level Physics Software (CUPS)", published by John Wiley & Sons,
Inc. (1995), authors: Robert Ehrlich and Jaroslaw Tuszynski of George
Mason Univeristy, VA, Lyle Roelofs of Haverford College, PA, and Ronald
Stoner of Bowling Green University, OH.

These same people may have what you're looking for [hopefully].

Sincerely,

Manny Barron
EMC Staff Engineer
Tandem Computers, Inc.

------------ ORIGINAL ATTACHMENT --------
SENT 04-20-97 FROM SMTPGATE @MAILMN (johnlin@tao.dec.com)

Hi,
I study SI problems on PCB board level. I am interested in studying the
behavior of wave travelling on a wire and reflected because of impedance
mismatch.

It is great helpful to have a visual aid,an animation program on PC, to
show wave's travelling.

Can anyone provide me a informatin/point for any animation programs to
show
wave travelling on a wire -- reflection due to impedance mismatch?

Thanks in advance.
JOHNLIN

johnlinc@ms5.hinet.net /
johnlin@mail.dec.com