Download Electromagnetics Explained. A Handbook for Wireless/Rf, EMC, by Ron Schmitt PDF

By Ron Schmitt

  • Providing a accomplished and functional realizing of electromagnetic fields and the rules important for circuit layout at RF, this booklet is a necessary source for analog and electronic engineers alike. -Poptronics


, Pages xi-xiii, Ron Schmitt

, Pages xv-xvi
1 - creation and Survey of the Electromagnetic Spectrum

, Pages 1-24
2 - basics of electrical Fields

, Pages 25-49
3 - basics of Magnetic Fields

, Pages 51-74
4 - Electrodynamics

, Pages 75-88
5 - Radiation

, Pages 89-109
6 - Relativity and Quantum Physics

, Pages 111-137
7 - The Hidden Schematic

, Pages 139-152
8 - Transmission Lines

, Pages 153-179
9 - Waveguides and Shields

, Pages 181-207
10 - Circuits as courses for Waves and S-Parameters

, Pages 209-228
11 - Antennas: the right way to Make Circuits That Radiate

, Pages 229-250
12 - EMC

, Pages 251-306
13 - Lenses, Dishes, and Antenna Arrays

, Pages 307-320
14 - Diffraction

, Pages 321-329
15 - Frequency Dependence of fabrics, Thermal Radiation, and Noise

, Pages 331-347
Appendix A - electric Engineering e-book Recommendations

, Pages 349-352

, Pages 353-359

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Extra info for Electromagnetics Explained. A Handbook for Wireless/Rf, EMC, and High-Speed Electronics

Example text

You may have heard that some particle physicists have been searching for magnetic charges (or "magnetic monopoles," as the particle physicists call them) in high-energy experiments. In fact, m a n y unified theories of physics require such particles. However, at this point such particles have not been found. Even if they were to be found, they would be so rare as to be inconsequential to everyone except the particle physicists and cosmologists. Instead of hoping for magnetic charges to bail us out, you need to just accept the fact that magnetic fields are inherently different from electric fields.

W h e n a field is applied, the molecules tend to line up so that their negative sides are facing the positive voltage. The molecules therefore set up a secondary electric field that opposes the direction of the applied field. The result is that inside the dielectric material, the net electric field is reduced in value. The ratio of the applied field to the reduced field is called the (relative) dielectric constant, er. 85 x 10-12F/re. The dielectric constant of a material has a direct effect on capacitance.

However, this analogy is not quite correct. Each electron is smeared out in a three-dimensional cloud called an orbital. Atoms can lend out or borrow electrons, which leaves the atom with a net charge. Such atoms are called ions and they can be positively charged (missing electrons) or negatively charged (extra electrons). Ions of opposite charge can attract one another and form ionic bonds. These b o n d e d ions are called molecules. Table salt, NaC1, is a good example of molecules. Each salt molecule consists of a positive ion (Na +) and a negative ion (C1-).

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