Electromagnetics explained: a handbook for wireless, RF, by Ron Schmitt

By Ron Schmitt

Regardless of the hi-tech sound of the themes lined, this e-book includes little or no math, and ways its issues in most cases from an intuitive perspective. the writer evidently is aware his topic rather well, and considers his task to be making that topic as effortless to appreciate as attainable in a quick survey of the sector. He does that task good.

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Additional info for Electromagnetics explained: a handbook for wireless, RF, EMC, and high-speed electronics

Example text

This figure shows how the electric field looks inside a currentcarrying wire. 1. Note that salt water and body tissue are much more conductive than distilled water. The conductivity is caused by dissolved chemicals like salt, which dissolves into Na+ and Cl- when placed in water. These ions act to conduct electricity. Also notice that the typical ground is not a very good conductor. Keep in mind that these values are for DC and low frequency. All materials, conductors and insulators, change characteristics at different 48 FUNDAMENTALS OF ELECTRIC FIELDS frequencies.

Now if we place a voltage across a metal wire (or resistor), an electric field is developed through the wire. The electric field causes the conduction electrons to move more toward the positive (+) end of the wire. In other words, a current is produced. This current is a direct current (DC) so it has a constant value. Current is defined as the amount of charge through a cross section of wire, per second. This definition implies that the charges are moving 32 FUNDAMENTALS OF ELECTRIC FIELDS at a steady, constant value.

In a similar manner, the electrons just serve to pass the electromagnetic signal from source to load. This statement is true at all electronic frequencies, DC, low frequency, and RF. MICROWAVE TECHNIQUES At microwave frequencies in the GHz range, circuit theory is no longer very useful at all. Instead of thinking about circuits as electrons flowing through a pipe, it is more useful to think about circuits as structures to guide and couple waves. At these high frequencies, lumped elements such as resistors, capacitors, and inductors are often not viable.

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