The EM Spectrum - University of Arizona

Fundamentals of
Applied Electromagnetics
Richard W. Ziolkowski
Department of Electrical and Computer Engineering
The University of Arizona
Thoughts borrowed from course presentation materials
Fundamentals of Applied Electromagnetics
Ulaby and Ravaioli
7th Ed
Spring Semester
11 January, 2017
Maxwell’s Equations
Time and Phasor Domain
It is much easier to deal
with exponentials in the
phasor domain than
sinusoidal relations in
the time domain
Just need to track
magnitude/phase,
knowing that
everything is at
frequency ω
Maxwell’s Equations
Sinusoidal time variations
Materials: ε, µ - time independent, isotropic, homogenous, linear
Static vs. Dynamic
Static conditions:
(a) charges are stationary or moving, but if moving, they do so at a constant velocity
(b) size of system much smaller than a wavelength
Under static conditions, electric and magnetic fields are independent,
but under dynamic conditions, they become coupled.
Types of Waves
Plane Waves: fundamental solutions of Maxwell’s equations
E
TEM Wave
H
D.O.P.
Guided EM Waves
Unbounded EM Waves
Types of Transmission Modes
TEM (Transverse
Electromagnetic)
: Electric and
magnetic fields
are orthogonal
to one another,
and both are
orthogonal to
direction of
propagation
Examples of Antennas
Dimensions and Units
The EM Spectrum
Examples of EM Applications
Sci-Fi becomes reality – enabled by EM 
What is Next ????