T
Toshio Ihara
Researcher at Ministry of Posts and Telecommunications
Publications - 40
Citations - 1055
Toshio Ihara is an academic researcher from Ministry of Posts and Telecommunications. The author has contributed to research in topics: Radar & Attenuation. The author has an hindex of 13, co-authored 40 publications receiving 1012 citations. Previous affiliations of Toshio Ihara include National Institute of Information and Communications Technology.
Papers
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Journal ArticleDOI
Effects of antenna directivity and polarization on indoor multipath propagation characteristics at 60 GHz
TL;DR: From the results of measurements and ray-tracing simulations, the use of a directive antenna at the remote terminal is demonstrated to be an effective method of reducing the effects of multipath propagation.
Journal ArticleDOI
Polarization dependence of multipath propagation and high-speed transmission characteristics of indoor millimeter-wave channel at 60 GHz
TL;DR: In this article, a computer simulation was made to clarify the polarization dependence of the high-speed transmission characteristics of an indoor communications system operating at 60 GHz in a room within a modern office building.
Journal ArticleDOI
Measurements of reflection and transmission characteristics of interior structures of office building in the 60-GHz band
K. Sato,Takeshi Manabe,Toshio Ihara,H. Saito,S. Ito,T. Tanaka,K. Sugai,N. Ohmi,Yasushi Murakami,M. Shibayama,Y. Konishi,T. Kimura +11 more
TL;DR: In this paper, the reflection and transmission coefficients of typical walls, floor, ceiling, window, and partitions were measured at 57.5 GHz and compared with the reflection characteristics estimated by multilayer dielectric models.
Proceedings ArticleDOI
Measurements of reflection characteristics and refractive indices of interior construction materials in millimeter-wave bands
TL;DR: The authors 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.
Journal ArticleDOI
Measurement of the complex refractive index of concrete at 57.5 GHz
TL;DR: In this paper, the authors measured the complex refractive index of concrete at 57.5 GHz by the combined use of free-space reflection and transmission methods and showed that the reflection coefficient of a concrete plate is less dependent on water content.