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oai:fut.repo.nii.ac.jp:00000150 2023-06-20T14:39:00Z 1

直線、湾曲したトンネル内電波伝搬特性の理論解析 Analysis of propagation characteristics of radio waves in straight and curved tunnels 笠嶋, 善憲 Kasashima, Yoshinori This paper analyzes radio wave propagation characteristics in straight and curved tunnels with rectangular cross sections and multi-layer-structure walls. These walls consist of a surface material, concrete layer, and bedrock. The wavelengths are assumed to be small compared with the tunnel's cross section. In the analysis, the geometrical optic approximation is used to determine the radio wave propagation routes in those tunnels. Also, the author uses the calculation of the reflection loss for radio waves against tunnel multi-layer walls. In addition, the author gives an example of the calculation of radio wave propagation characteristics in straight and curved tunnels with rectangular cross sections. 福井工業大学 2008-05-31 jpn departmental bulletin paper VoR https://doi.org/10.57375/00000144 https://fut.repo.nii.ac.jp/records/150 10.57375/00000144 TF00008603 2868571 福井工業大学研究紀要. 第一部 38 23 30 https://fut.repo.nii.ac.jp/record/150/files/KJ00005074508.pdf application/pdf 404.5 kB 2023-04-12