sured by positioning database can be good. However, furniture is of course not horn antennas on both sides of the wall and measuring the included: the reliability of the field prediction with re- attenuation of the transmitted power directly through spect to measurements on a real, furnished building is the wall. For most of the walls it was possible to obtain therefore questionable no matter the accuracy of the constitutive parameters that are valid over the whole adopted model. The electromagnetic description of both frequency range from 600 MHz to 5.2 GHz (see Table outdoor and indoor environments is also inaccurate be- 4.7-1). However, this was not possible for the walls of the cause of the lack of related information. Compound ma- MRTo room, because the copper EMC shielding of this terials are often treated adopting effective electromagnetic room shows a sensible frequency dependent behaviour. parameters, i.e. parameters representative of the overall Therefore, its effective conductivity was determined behaviour of the compound in terms of reflection, trans- separately for all five frequencies, Table 4.7-2. mission and diffraction of an incoming wave. A usual Similar measurements on electromagnetic para- choice is to use literature or empirical values for the meters were carried out by [JePK05] and [JKVW05] by CHAPTER 4.7 Propagation modelling and channel characterisation Table 4.7-1 Composition of walls in hospitals and constitutive parameters. Type of room Material Thickness o(S/m) Sick room Plasterboard 2.5 cm Rock wool 7.5 cm Plasterboard 2.5 cm X-ray room Plasterboard 2.5 cm 1.0 mm Rock wool 7.5 cm Plasterboard 2.5 cm Operating room I CrNi-steel 0.8 mm Plasterboard 1.8 cm Rock wool 7.5 cm Plasterboard 1.8 cm CrNi-steel 0.8 mm Operating room Il Trespa" 0.5 cm Plasterboard 2.0 cm 0.5 mm Rock wool 7.5 cm Plasterboard 2.0 cm Trespa TM 0.5 cm MRTo room Chipboard 1.3 cm Styrofoam 2.0 cm Copper shield 0.16 cm o (f) (see Table 4.7-2) Rock wool 7.0 cm Plasterboard 2.5 cm Rock wool 7.5 cm Plasterboard 2.5 cm perf