So I'm trying to model the effects of wet and dry road surfaces for mm wave communication. My first attempt was to model the road as dry asphalt covered with a thin layer of water, but I'm not sure this is accurate enough since the water would be seeping into the asphalt in reality.

Is the Maxwell-Garnett equation for mixing dielectrics applicable here? I saw that the ITU-R recommendation on the surface of the earth used it to approximate the permittivity of wet ice, but I'm wondering if there's any reasons it shouldn't be used here.

  • \$\begingroup\$ So, you're trying to communicate between two devices exclusively along the wet surface of an asphalt covered road without having some form of "air" connection? That's how it reads. \$\endgroup\$ – Andy aka Jun 12 at 15:20
  • \$\begingroup\$ Andy aka, sorry maybe I wasn't very clear. The system I'm modeling is two antennas with line of sight sitting several meters above the road, I'm most interested in modeling the multi-path effects though, so I need to accurately represent the road surface below the antennas \$\endgroup\$ – user195951 Jun 12 at 15:24
  • \$\begingroup\$ water would be seeping into the asphalt ... are you really sure about that? \$\endgroup\$ – jsotola Jun 12 at 19:47
  • \$\begingroup\$ Jsotola, I really wasn't sure at all. If that doesn't happen in reality then I guess modeling it as a layer of water on top should be good enough \$\endgroup\$ – user195951 Jun 12 at 20:03

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