#
__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**

**Return to top of page.**

**Return to HOC home page.**

Henry Ott Consultants
48 Baker Road Livingston, NJ 07039
Phone: 973-992-1793, FAX: 973-533-1442

December 5, 2003