Table 9. Dielectric Properties of Various Building Materials Reported at 3 GHz Dry Wet Sand, loam K 2.5 D 0.001-0.006 (15% water) Clay K 2.3 D 0.015 11,3 0.25 ( 20% water) Magnetite K 1.0 D 0.10 0^2 ( 11% water) Brick wall a 0.5 0.7 dB/cm Wooden panel ex 0.5-1 1-2 dB/cm Roofing shingles ex 1.1-2.7 3.3-3.6 dB/cm Figure 6. Attenuation rate a of various materials at 3 GHz as a function of the water content. Percent Water Content
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