User talk:Geoff9614

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Happy editing! Constant314 (talk) 17:56, 28 April 2024 (UTC)[reply]

Antennas[edit]

Where to begin?

Metal is just another media. All the usual wave equations apply inside the metal. There are continuity requirements at the interfaces between medias. Usually, we think of radio waves as bouncing off an air to metal interface, but in fact the radio waves do penetrate into the metal to a depth of one skin depth. The requirements are these:

For the E and H fields, the component of the field that is parallel to the interface is continuous across the interface.
For the D and B fields, the component of the field that is normal to the interface is continuous across the interface.

From the above, when a radio wave strikes metal, there must be some E-field inside the metal, which has a high conductivity. If you have an E-field inside a highly conductive material, then there must be currents in the material. Constant314 (talk) 18:12, 28 April 2024 (UTC)[reply]