Infinitely conducting metal

The infinitely conducting metal is a model in electromagnetism of real metals in the field of the microwaves. In this field wavelength, the majority of metals are conducting very good, i.e. electric conductivity is very high (the resistance of material to the propagation is low). A model good of approximation is thus to make tighten this conductivity towards the infinite one, one thus obtains the model of infinitely conducting metal, near of real metals in microwaves, and having the following remarkable properties:

conductivity inside metal is infinite (its resistance is null).
the electromagnetic field inside is null.
No dissipation by Joule effect.
Subjected to an external incidental wave: the thickness of skin being null, the wave does not return in metal.
It is thus completely reflective, absorption and the transmission inside metal being null.
It is the seat of a surface current localized on its surface.

Example: for a plan of metal mass infinitely conducting, the wave is completely reflected, but contrary to dielectric, there is a dephasing of the wave reflected compared to the incidental wave.

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