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#8
February 2nd 08, 06:55 PM
posted to rec.radio.amateur.antenna
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Waves vs Particles
"AI4QJ" wrote in message ... "Roy Lewallen" wrote in message ... AI4QJ wrote: "Cecil Moore" wrote in message ... wrote: Cecil Moore wrote: Quoting "Alpha and Omega", by Seife, "Empty space is an incredibly complex substance, ... Are you saying space is a fluid? Maybe "an incredibly complex substance" exhibits some characteristics of a fluid? I should say "characteristic" impedance is 377 Ohms. It also has a permitivity and permeability of 1 ;-) I'm sure you mean relative permittivity and relative permeability. No, this is not correct. The permitivities and permeabilities of all materials are relative to free space. Free space is assumed to be 1 and the other values are relative to it. The characteristic impedance is the square root of permeability divided by permittivity, so if both are one, the characteristic impedance would have to be one. No, this is not correct. According to "Reference Data for Radio Engineers", published by International Telephone and Telegraph, fourth edition, page 35: "Properties of Free Space" Permeability = 1.257 * 10^-6 henry per meter. Permittivity = 8.85 * 10^-12 farad per meter. Characteristic impedance = sqrt(Permeability/Permittivity) = 376.7 ohms John |
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