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Journal of the Korean Institute of Electromagnetic and Science 2001;1(1):30-36.
Estimation of Microwave Path Loss and Cross-Polarization Coupling in a Simple Urban Area
Oh Yisok1, Chan-Ho No2, Hyuk-Je Sung3, Byung-Hoon Lee3, Yeon-Geon Koo1
1Department of Electronics and Electrical Engineering, Hong-Ik University
2Etronics Corp
3Pantech Co., Ltd
Abstract
Whereas it is well known that microwave propagation around corners of urban area is estimated well by the uniform geometrical theory of diffraction (UTD), it is not clear how much depolarization occurs at a given receiver position and how much transmission through walls affects to total path loss. This paper presents the results of the ray tracing simulation to answer these questions. Simulations of microwave propagation around corners were performed for various line-of-sight (LOS) and out-of-sight(OOS) positions of a receiver, by summing the electrical fields of reflected, diffracted and transmitted rays coherently. Since height difference between transmitter and receiver, as well as ground plane, causes depolarization, the ray tracing simulation estimates the cross-polarization coupling. It was found that the cross-polarization coupling decreases as receiver moves away from transmitter. Another part of the study focused on the signal transmitted through building walls of the corner. It was found that the transmitted field is dominant at OOS region when the conductivity of the walls is low (for example, lower than 0.0l S/m). The simulation results of the ray tracing technique in this study agreed well with an experimental measurement around corners.
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