Measurements of reflection characteristics and refractive indices of interior construction materials in millimeter-wave bands

Katsuyoshi Sato, Hideki Kozima, Hiroshi Masuzawa, Takeshi Manabe, Toshio Ihara, Yoshinori Kasashima, Katsunori Yamaki

Research output: Contribution to journalConference articlepeer-review

59 Citations (Scopus)

Abstract

The reflection characteristics and refractive indices of construction materials in 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, we have measured the reflection and transmission coefficients of a concrete plate, a plasterboard, a rock wool, a floorboard, a tile carpet, 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, a plasterboard, a floorboard, and a 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%. We 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 tile carpets with rough surfaces.

Original languageEnglish
Pages (from-to)449-453
Number of pages5
JournalIEEE Vehicular Technology Conference
Volume1
Publication statusPublished - 1995 Jan 1
Externally publishedYes
EventProceedings of the 1995 IEEE 45th Vehicular Technology Conference. Part 2 (of 2) - Chicago, IL, USA
Duration: 1995 Jul 251995 Jul 28

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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