Impedance Of Free Space

The z o of free space like characteristic impedance in general is expressed in ohm s and is theoretically independent of wavelength.

Impedance of free space. In physics impedance of free space also known as the characteristic impedance of free space is a physical constant denoted by z 0 relates the magnitude of the magnetic field and the electric field of electromagnetic radiation travelling through free space. The characteristic impedance of free space is equivalent to the sq root of the proportion of penetrability of free space henrys per meter to the penetrability of free space farads per meter. The electric field and magnetic field of a signal are related by the wave impedance. That is z 0 e h where e is the electric field strength and h is the magnetic field strength.

Impedance of free space derivation. 1 2 impedance matching free space one of the important consequences of acknowledging the impedance of free space is recognizing that in order to get maximum power transfer into your antenna and to avoid reflecting the incoming wave back out into space you need to match the impedances of the signal path inside your antenna to 376 73 ω. The characteristic impedance of free space also called the z o of free space is an expression of the relationship between the electric field and magnetic field intensities in an electromagnetic field em field propagating through a vacuum. The wave impedance of free space is 377 ohms.

Z 0 μ 0 ε 0 displaystyle z 0 sqrt frac mu 0 varepsilon 0 where ε 0 is the permittivity constant in free space and μ 0 is the permeability constant in free space and. It is expressed as the square root of the ratio of permeability of free space to the permittivity of free space.