Whites, EE 382
Lecture 31
Page 1 of 8
Lecture 31: Electromagnetic
Radiation and Antennas
Weve seen in the past few lectures that electromagnetic (EM)
waves can transport power from one position to another without
any intervening guiding structure or mater
Whites, EE 382
Lecture 26
Page 1 of 10
Lecture 26: Uniform Plane Waves.
Infinite Current Sheets.
Over the past weeks, weve seen that voltage and current waves
can propagate along transmission lines. Examples of TLs, as we
saw, included coaxial cables, twi
Whites
10f2
EE 382 - Applied Electromagnetics
Homework #10
35 points
Date Assigned: 4/4
Date Due:
,fi)somce
and a load of
10.1 A lossless 200-0 transmission line is connected between
ZL = 140- j100 n. Using the Smith chart, determine a length of thi
Whites, EE 382
Lecture 24
Page 1 of 6
Lecture 24: Single-Stub Tuner I
Analytical Solution.
Instead of requiring a special /4-length of TL to a match a load
to a TL, as discussed in the last lecture, other matching
techniques can be used.
One of these is
Whites, EE 382
Lecture 23
Page 1 of 8
Lecture 23: TL Matching. Quarter-Wave
Transformers. Resistive Pads.
Transmission lines are commonly used as components in
communication systems. In this capacity, the TL functions as a
conduit for an electrical signal
Whites, EE 382
Lecture 21
Page 1 of 10
Lecture 21: Lossy TLs. Dispersionless TLs.
Special Cases for General TLs.
Real transmission lines such as coaxial cables have losses
that will, among other effects, attenuate the signal as it
propagates along the TL.
Whites, EE 382
Lecture 17
Page 1 of 7
Lecture 17: Sinusoidal Steady State
Excitation of Lossless Transmission Lines.
We will continue our TL studies by considering the steady state
response of TLs to sinusoidal excitation. Communication
systems and power
Whites, EE 382
Lecture 13
Page 1 of 11
Lecture 13: Transmission Line Termination,
Reflections. Current Waves.
The TLs weve considered so far were semi-infinitely long. This
is useful when trying to understand basic behavior such as V and
I wave propagatio
Whites, EE 382
Lecture 19
Page 1 of 7
Lecture 19: Input Impedance of TLs.
Excitation and the Source Conditions.
Keeping with standard circuits concepts, we can define the TL
impedance at any position z as simply the ratio
V z total voltage at z
Z z
(1)
I
Whites, EE 382
Lecture 18
Page 1 of 5
Lecture 18: Termination of TLs.
Load Reflection Coefficient.
In the last lecture, we considered for the first time TLs in the
sinusoidal steady state. We will now consider the termination of
TLs that are excited by si
Whites, EE 382
Lecture 15
Page 1 of 6
Lecture 15: Pulse Propagation on TLs.
The bounce diagram can be used to analyze the transient
response of a TL to other types of excitations besides the unitstep, which is all weve considered to this point.
For exampl
EE 382
Lecture 27
Page 1 of 8
Lecture 27: Uniform Plane Waves in
Lossy Materials. Skin Depth.
All real materials have loss, to one extent or another. We will
now consider uniform plane waves that propagate through lossy
materials. The only loss mechanism
EE 382
Lecture 28
Page 1 of 9
Lecture 28: Poyntings Theorem.
Power Flow and Plane Waves.
A propagating electromagnetic (EM) wave carries energy with
it. Physically this makes sense to us when we listen to the radio
or talk on a cell phone. These types of
Whites, EE 382
Lecture 34
Page 1 of 10
Lecture 34: Antenna Radiation Patterns.
Directivity and Gain.
No physical antenna radiates uniformly in all directions. Rather,
antennas radiate EM waves better in certain directions than
others. In fact, many antenn
Whites, EE 382
Lecture 22
Page 1 of 14
Lecture 22: Smith Chart.
The Smith chart is a very useful graphical tool for the analysis of
TLs. It was developed by Phillip H. Smith in the 1930s.
The Smith chart remains a very useful tool today primarily to
visua
Whites, EE 382
Lecture 25
Page 1 of 11
Lecture 25: Single-Stub Tuner II
Smith Chart Solution.
We will next consider single-stub tuner analysis using the Smith
chart. Before looking at this, however, we must first understand
that the Smith chart can be us
Whites, EE 382
Lecture 33
Page 1 of 13
Lecture 33: Near and Far Fields of the
Hertzian Dipole Antenna. Radiation
Resistance.
In the previous lecture, we calculated the phasor E and H fields
produced by a Hertzian dipole antenna of current I az I and
lengt
Whites, EE 382
Lecture 35
Page 1 of 10
Lecture 35: Antenna Effective Aperture.
Friis Equation.
Up to this point in our discussion about antennas we have only
discussed their transmitting characteristics. In a communication
system, we need both transmittin
Whites, EE 382
Lecture 32
Page 1 of 8
Lecture 32: Hertzian Dipole Antenna.
In the previous lecture, we discussed the fundamental sourcefield relationship that can be used to calculate the E and H
fields produced by sinusoidal steady state line currents. I
Whites, EE 382
Lecture 30
Page 1 of 5
Lecture 30: Example of a Normally
Incident UPW on a Lossless Half Space.
Example N30.1. A UPW is incident from free space onto a
glass half space with r 4 and r 1, as shown in the figure
below. It is specified that
E
Whites, EE 382
Lecture 20
Page 1 of 8
Lecture 20: Generalized Reflection
Coefficient. Crank Diagram. VSWR.
As we saw in the previous lecture, for a lossless TL with an
arbitrary load and this chosen coordinate system
the voltage and current on the TL can
Whites, EE 382
Lecture 29
Page 1 of 8
Lecture 29: UPWs Normally Incident
on a Lossless Half Space.
The current sheet solution in Lecture 26 provided us with much
information on the properties of uniform plane waves:
E H gives the direction of wave propag
Whites, EE 382
Lecture 14
Page 1 of 8
Lecture 14: Bounce Diagrams.
The bounce diagram can be a useful tool for the analysis of unitstep and pulse voltage (or current) responses of TLs.
In the bounce diagram, distance is shown along the horizontal
axis and
,
lof2
Whites
EE 382 - Applied Electromagnetics
Homework #9
30 points
r-._-
!
I
Date Assigned: 3/28.~
Date Due: 4/4
9.1 Text problem 11.9. Add this part to the question: (d) In how many miles will the voltage
drop by 10 dB along the telephone line?
Whites, EE 382
Lecture 1
Page 1 of 7
Lecture 1: Magnetic Circuits.
The first topic of this course is actually a continuation of
magnetostatics from EE 381 last semester. This topic is
magnetic circuit analysis and it’s a lumped-element method for
solving
Whites, EE 382
Lecture 2
Page 1 of 5
Lecture 2: Faradays Law of Induction.
Lenzs Law.
Last semester in EE 381 Electric and Magnetic Fields, you saw
that in
Electrostatics: stationary charges produce E (and D )
Magnetostatics: steady currents (charges in
EE 382 Applied Electromagnetics
Lecture Notes
Keith W. Whites
Spring 2014
Laboratory for Applied Electromagnetics and Communications
Department of Electrical and Computer Engineering
South Dakota School of Mines and Technology
2014 Keith W. Whites
Whites
Whites
lof2
EE 382 - Applied Electromagnetics
Homework #8
40 points
Date Due: 3/21
/'8.1 A section of lossless coaxial cable having Zo = 50 n and u 200 mlJ.ls is terminated in a
open circuit and operated at a frequency of 800 MHz. Determine the shorte
Page I of2
Whites
EE 382 - Applied Electromagnetics
Homework #4
45 points
C
Date Assigned: 1131
Date Due: 217
4.1 Dry, sandy soil has 0" l :; 2.3 X 10-9 S/m and 8, l :; 3.45 at 60 Hz, while at 10 GHz
0"ll:;5.6x1O-3 S/m and 8, ll:;2.5. Distilled wate