Difference between guided wavelength and free space wavelength
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Guide wavelength is defined as the distance between two equal phase planes along the waveguide. The guide wavelength is a function of operating wavelength (or frequency) and the lower cutoff wavelength, and is always longer than the wavelength would be in free-space.
a radio frequency signal of 30MHz has a free space wavelength of 10 meters. ... So in making antennas, you make the actual length of the elements according to the wavelength (or fraction thereof) of the signal in your wire, as contrasted to the length in free space.
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The definition of wavelength is the distance between points of equal phase along the wave. In free space, this is trivial and is related to the frequency and the speed of light . In the waveguide, however, the wavelength is different than it would be in free space.
a radio frequency signal of 30MHz has a free space wavelength of 10 meters. ... So in making antennas, you make the actual length of the elements according to the wavelength (or fraction thereof) of the signal in your wire, as contrasted to the length in free space.
the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats. It is thus the inverse of the spatial frequency.