Title :
Measurements of reflection characteristics and refractive indices of interior construction materials in millimeter-wave bands
Author :
Sato, Katsuyoshi ; Kozima, Hideki ; Masuzawa, Hiroshi ; Manabe, Takeshi ; Ihara, Toshio ; Kasashima, Yoshinori ; Yamaki, Katsunori
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan
Abstract :
The reflection characteristics and refractive indices of construction materials in the millimeter wave bands are needed for development of millimeter-wave application systems such as indoor communication systems and short-range sensing systems. Because so little experimental data of construction materials at millimeter-wave bands has been available, the authors have measured the reflection and transmission coefficients of a concrete plate, plasterboard, rock wool, a floorboard, a carpet tile, at 57.5, 78.5, and 95.9 GHz. The refractive indices of the materials that can be modeled as a homogeneous dielectric plate with a smooth surface were estimated by the combined use of reflection and transmission data. The refractive indices of a concrete plate, plasterboard, a floorboard, and rock wool at 57.5 GHz were found to be 2.55-j0.084, 1.50-j0.01, 1.98-j0.083, and 1.26-j0.005, respectively. These indices showed little frequency dependence in the measured frequency range, except for that of the floorboard, which varied about 10%. The authors also measured the reflection characteristics of materials with inhomogeneous structures or rough surfaces, and found that the specular reflection from a concrete plate and a floorboard can be reduced significantly by covering them with carpet tiles with rough surfaces
Keywords :
electromagnetic wave reflection; electromagnetic wave transmission; indoor radio; millimetre wave propagation; refractive index; 57.5 GHz; 78.5 GHz; 95.9 GHz; EHF; carpet tile; concrete plate; floorboard; frequency dependence; homogeneous dielectric plate; indoor communication systems; inhomogeneous structures; interior construction materials; millimeter-wave application systems; millimeter-wave bands; plasterboard; reflection characteristics; refractive indices; rock wool; rough surfaces; short-range sensing systems; smooth surface; specular reflection; Building materials; Concrete; Dielectric materials; Millimeter wave communication; Millimeter wave measurements; Reflection; Rough surfaces; Surface roughness; Tiles; Wool;
Conference_Titel :
Vehicular Technology Conference, 1995 IEEE 45th
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-2742-X
DOI :
10.1109/VETEC.1995.504907