NNSE 508 EM
Lecture #4
1
Lecture
contents
•
Macroscopic Electrodynamics
–
Propagation of EM Waves in dielectrics and metals
This
preview
has intentionally blurred sections.
Sign up to view the full version.
NNSE 508 EM
Lecture #4
2
•
Maxwell equations describing the “coupling” of electric and
magnetic fields
•
Interaction with medium:
in most simple cases linear isotropic :
•
Polarization is linear function of electric field
•
Interaction is scalar, local and synchronous
Maxwell Equations
ev
D
q
0
R
D
E
E
B
E
t
D
H
J
t
0
B
1
B
E
c
t
J
c
t
D
c
H
4
1
4
D
0
B
[SI]
[CGS]
D
E
H
B
J
E
0
R
B
H
H
J
E
;
4
P
E
D
E
P
( , )
( , )
D r t
E r t
Further in this section
the “total” permeability
and permittivity will be
used
NNSE 508 EM
Lecture #4
3
Maxwell’s Equations
for a Isotropic, Linear, Source
-
Free, and Lossless Medium
•
Obviously, there must be a source for the
field somewhere.
•
However, we are looking at the properties
of waves in a region far from the source.
•
Wave equations for electromagnetic
Waves in a Simple, Source-Free, Lossless
Medium
•
The wave equations are not independent.
•
Usually we solve the electric field wave
equation and determine
H
from
E
using
Faraday’s law.
2
2
2
2
2
2
E
E
E
H
E
t
t
H
H
H
E
H
t
t
0
0
2
2
2
0
H
H
t
2
2
2
0
E
E
t
This
preview
has intentionally blurred sections.
Sign up to view the full version.
NNSE 508 EM
Lecture #4
4
Propagation of electromagnetic waves in an isotropic
linear, source-
free, and lossless medium
•

This is the end of the preview.
Sign up
to
access the rest of the document.
- Spring '11
- SergeOktyabrsky
- EM Lecture
-
Click to edit the document details