# Structure and Usage of the Material Table

At the left of the table, in the main sheet Values, the material names and their description are shown in English and German.

Column E shows the source where the physical material parameters were extracted from. The physical material values ( ${\epsilon }_{r}{}^{\prime }$ and ${\epsilon }_{r}{}^{\prime \text{​}\prime }$ ) are basically also frequency dependent. Therefore, column F shows at which frequency the values in columns H and I (which were taken from the sources) were determined by the sources.

The following values can be specified by the user in the table:
• Frequency [MHz]
• Thickness of the material / wall [m]
• Roughness of the surface

The frequency can be entered in cell G3 and will automatically be copied to column G. Alternatively, the user can also enter specific values in the individual cells of column G, as for the computation the frequency value is read from this column.

The thickness of the materials is set to reasonable default values. As the materials are completely different, the thickness’s are defined for each material individually (unlike the frequency).

Also, the roughness of the material is defined individually. All values are set to 1.0 by default which corresponds to a smooth surface.

After having entered the values, the attenuation of the reflected wave in comparison to the incident wave (reflection loss) and the loss that an electromagnetic wave experiences when penetrating a wall (transmission loss) can be read from columns M and R. All values are given in [dB].

These values can then be entered in the Edit Material dialog in WallMan.

Note:

The thickness in the Material Properties dialog in WallMan is only used for the display, not for the prediction.

The thickness has to be taken into account when computing the losses with the material table.