Electromagnetics-It's not Black Magic

Eldon Gordon
Barn Swallow Publication
4596 County Road 2629
Caddo Mills, TX 75135
eldongordon@earthlink.net
www.barnswallowpublications.net

This book is a compilation of assorted subjects in electromagnetics (EM) theory and application. Generally, the EM topics may not have been fully described and explain in your formal education. The book begins simply by explaining what EM is and where it comes from. It progresses to more in depth coverage of various EM phenomena. There is special attention to how EM travels and interacts with other objects; especially antennas and dielectrics. There is special attention to topics which the author found particularly difficult to fully understand, under the assumption that others may have had similar experiences.

There are two new EM procedures, invented by, and copyrighted by, the author.

The first is a new equation to estimate the directivity of an antenna. It is very easy to remember and is more accurate than others in the literature.

The second presents a new way to solve the equations associated with EM polarization. The author discovered a way to use Cartesian coordinates with the Poincare' sphere, eliminating the need for spherical equations. The resulting equations are much simpler than those usually found in the literature. In addition, the Cartesian/Poincare' sphere graphic is very intuitive and aids greatly in understanding how polarization works. 



Table of Contents

   Introduction
   Magic
   Backbone Parameters
   Energy, Power and Work
   The Objective
   The System
   Defining the Backbone Parameters
   More on Energy
   Voltage, Current and Power
   Radiation
   Electrons, Current and Radiation
   Quantifying Radiation
   Analysis Methodology
   Switching from Current to Voltage
   The Mathematics of EM Analysis
   Euler's Equation
   Special Features of Sine Waves
   Scalars and Vectors
   Antenna Field Regions
   Near Field
   Intermediate Field
   Far-field
   Logarithms and dB
   Integrals
   Antennas and Radiation Patterns
   A Real Dipole
   Complex Impedance and Ohm's Law
   Non-Linearity, Signal Modulation and Intermodulation
   Time and Frequency Domains
   Reality Subjects
   Periodic Signals
   Transmission Lines and Waveguides
   Standing Waves
   Noise Figure and G/T
   Cascaded Operation
   G/T of a System	
   Modulated Signals
   Harmonic Products of Non-Linearity
   Small and Large Antennas
   EM Striking and Object
   Directivity and Area
   Directive Gain and Beamwidth
   Signal Projected from Antenna and Far Field
   Propagation Link
   Skin Depth
   Antenna Arrays
   Directivity and Pattern Multiplication
   My Paper on Directivity
   Polarization
   Polarization Types
   My Paper on Polarization
   The Poincare' Sphere
   The x,y,z Poincare' Sphere
   Equations in Excel
   Radomes
   Radome Geometry
   A Radome

   Appendix A
      Derivation of velocity and acceleration
   Appendix B
      Complex Impedance and Circuits
   Appendix C
      Lossy Transmission Lines
   Appendix D
      Measuring Polarization
   Appendix E
      Rotating Linear Measurements
   Appendix F
      Polarization without phase
   Appendix G
      Vector Multiplication and the Poynting Vector