Title: Analysis and characteristics of diffracted waves going over building rooftop

Authors: Jiro Iwashige, Leonard Barolli, Katsuki Hayashi

Addresses: Department of Information and Communication Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-Ku, Fukuoka 811-0295, Japan. ' Department of Information and Communication Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-Ku, Fukuoka 811-0295, Japan. ' Graduate School of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-Ku, Fukuoka 811-0295, Japan

Abstract: In order to have an effective utilisation of the radio wave resources, it is important to estimate propagation path in the urban area. In our previous work, we have examined the diffracted fields by two edges with an arbitrary angle which are in different and same heights. In this paper, the characteristics of the diffracted fields by two horizontal edges of a building rooftop are discussed. The numerical calculations are carried out for two wedges of a building rooftop on perfect conductor and concrete wedges. The results show that the waves grazing on the rooftop of concrete building are considerably attenuated for the low concrete conductivity, but when parapets are constructed on the rooftop, the diffracted waves become stronger than the grazing waves.

Keywords: electromagnetic waves; wave scattered; building rooftops; geometric theory of diffraction; GTD; single diffraction; double diffraction; radio waves; propagation path estimation; urban areas; diffracted fields; concrete buildings; roof parapets.

DOI: 10.1504/IJSSC.2011.040346

International Journal of Space-Based and Situated Computing, 2011 Vol.1 No.2/3, pp.197 - 203

Received: 06 Jan 2011
Accepted: 23 Jan 2011

Published online: 26 Mar 2015 *

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