Antenna Theory Simplified
(New For 2004)
Why is Henry Ott Consultants (an EMC training and consulting
organization)
offering a course on Antenna Theory? Well, if a product, or PCB,
or cable radiates or is susceptible to electromagnetic energy, it is
acting
as an antenna. Besides, antennas are used in EMC testing, both emission
and susceptibility. In all these cases an understanding of some
basic
antenna theory would be very useful to the engineer or
technician.
However, the way that antenna theory is taught in schools and
universities
- it is too theoretical and abstract to be very helpful. Hence
our
course, Antenna Theory Simplified.
So, if you would like to understand how antennas work, but lack the
time and/or desire to study the intimidating mathematics normally
associated
with antenna theory, this one-day seminar is for you!
Transmitting
and receiving antennas are analyzed using circuit theory to
furnish
the practicing engineer or technician with an intuitive understanding
of
antenna operation. Transmission line theory combined with the
theory
of partial inductance are used to develop simple and accurate circuit
theory
models of dipole and loop antennas. These models are validated by
comparing them to the known field theory results.
Participants will, possibly for the first time, understand and may
even
enjoy antenna theory. This course is intended for engineers,
technicians,
regulatory compliance engineers, and managers who need a working
knowledge
as to how antennas work. The only prerequisite is a basic
understanding
of electrical circuit analysis.
This course will be especially useful to EMC test technicians and
engineers
who work with antennas daily doing EMC testing. They will go away
with a good understanding of the characteristics as well as the
advantages
and limitations of different types of antennas used for EMC
testing.
EMC test lab personnel, as well as others familiar with antennas, will
find this course provides the opportunity for obtaining antenna
theory
refresher training.
Outline
Circuit Theory Approach
Basic Concepts
Characteristics of Antennas
Approach
Applicability of Results
Circuit Theory Versus Field Theory
Transmission Lines
Equivalent Circuit of a Two-Wire Transmission Line
Theory of Partial Inductance
Transmission Line Input Impedance
Circuit Model Equations Versus Transmission Line Equations
From Transmission Line to Antenna
The Dipole Antenna
The Basic Dipole
Impedance of an Open Circuit Transmission Line
Current Distribution on a Dipole
Equivalent Circuit of a Dipole
Coupling Between Two Dipoles
Effective Height of a Dipole
Dipole Radiation Resistance
Impedance of a Dipole
Comparison With Schelkunoff's Mode Theory
Q of a Dipole
Broadbanding a Dipole
Impedance of a Monopole
The Loop Antenna
The Basic Loop
Impedance of an Short Circuit Transmission Line
Equivalent Circuit of a Loop
Coupling Between Two Loops
Loop Radiation Resistance
Comparison to Foster's Formula
Impedance of a Loop
Current Distribution in a Loop
Coupling Between Two Loops
Characteristics of Small Loops
The Small Dipole Versus Small Loop
Resonant Antennas
The Resonant Dipole
Resonance Verses Tuned Antennas
The Center Fed Dipole
Off Center Fed Dipoles
Simplified Field Theory Results
Fields Produced by a Transmitting Dipole
Equivalent Circuit of a Receiving Dipole
Reciprocity
Field Theory of Loop Antennas
Fields Produced by a Transmitting Loop
Equivalent Circuit of a Receiving Loop
Coupling Energy to an Antenna
Antenna Feed Lines
Baluns
Other Antenna Structures of Interest
Capacitively Loaded Dipoles/Monopoles
Inductive Loading
The Trap Dipole
The Isotropic Radiator
Yagi
Log Periodic
Biconical
Bow Tie
Bilog
Frequency Independent Antennas
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Henry Ott Consultants
48 Baker Road Livingston, NJ 07039
Phone: 973-992-1793, FAX: 973-533-1442
December 5, 2003