Explain why air impedance = 377ohm.?
Answer:
Well, the impedance of a medium is defined to be
Z = SQRT(mu/epsilon)
where epsilon is the dielectric constant of the medium
mu is the permeability of the medium
For a vacuum,
epsilon is 8.85418782 × 10-12 m-3 kg-1 s4 A2
mu is 1.25663706 × 10-6 m kg s-2 A-2
Plugging into the equation gives
Z = 377 Ohms
Since the permeability and permittivity of air is similar to a vacuum, we usually list the impedance of free space as 377 ohms.
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