Electromagnetic fields exist at frequencies from 0 Hz to at least 1020 Hz – that’s at least 20 orders of magnitude! This section describes some of the characteristics of the electromagnetic spe...Electromagnetic fields exist at frequencies from 0 Hz to at least 1020 Hz – that’s at least 20 orders of magnitude! This section describes some of the characteristics of the electromagnetic spectrum, including some of the conventional names given to electromagnetic waves over certain ranges of frequency.
This section provides broad definitions of electricity and magnetism and how they are related. It also provides some examples of modern technologies using electricity and magnetism.
This page covers the radiation emitted by Hertzian dipoles, including the derivation of electromagnetic fields using Maxwell’s equations and the Biot-Savart law. It emphasizes the behavior of far-fiel...This page covers the radiation emitted by Hertzian dipoles, including the derivation of electromagnetic fields using Maxwell’s equations and the Biot-Savart law. It emphasizes the behavior of far-field and near-field radiation, detailing the donut-shaped radiation pattern and the conversion of electromagnetic waves to circuit voltages by antennas. The analysis includes θ-polarized plane waves, focusing on intensity and total power radiated, with dependencies on antenna efficiency and wavelength.