- #1
Julle
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Calculating wavelength in a media
Hi
Trying to get how to calculate the wavelength of an electromagnetic wave in a media and I am getting confused about the permittivity.
I know the formula:
vphase = c/(sqrt(εr*μr))
where vphase is the phase velocity.
c is the speed of light in a vacuum.
εr is the relative permittivity.
μr is the relative permability.
Then to get the wavelength we do like this:
λ = vphase/f
where λ is the wavelength and f the frequency.
This is all well and good, but isn't there a real and imaginary part to the permittivity? Is only the real part used or is the entire complex number used in which case you end up with a complex distance??
Hi
Trying to get how to calculate the wavelength of an electromagnetic wave in a media and I am getting confused about the permittivity.
I know the formula:
vphase = c/(sqrt(εr*μr))
where vphase is the phase velocity.
c is the speed of light in a vacuum.
εr is the relative permittivity.
μr is the relative permability.
Then to get the wavelength we do like this:
λ = vphase/f
where λ is the wavelength and f the frequency.
This is all well and good, but isn't there a real and imaginary part to the permittivity? Is only the real part used or is the entire complex number used in which case you end up with a complex distance??
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