Antenna Fundamentals I

2.1 Electromagnetic Waves

Before 1800, we knew from Coulomb’s experiments in France that static electric charges obeyed a force law similar to Newton’s law for gravity, and that magnetic materials seemed to be made of magnetic charge-pairs that also obeyed such a force law. By 1830, Oersted in Denmark had observed that an electric current produced a magnetic force, Ampère in France had quantified its law, and Faraday in England had established the law that a changing magnetic field produces an electric force field. J. C. Maxwell in England put these facts together to conclude that time-varying magnetic and electric force fields generate each other (you can’t have one without the other), make waves, and that ...

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