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Finite-difference time-domain (FDTD) method is a direct solution of Maxwell differential equations. It changes the Maxwell curl equations that involve time variable to the difference equations in the gridding space, and changes all kinds of problems to the initial problems, and this change reflects all the time specialty of the electromagnetic wave, so the FDTD method can settle electromagnetic dispersion...
In this paper, based on the configuration of leaky coaxial cable (LCX) with vertical slots, combined with related electromagnetic radiation theory, the radiated field of LCX in free space is analyzed by the method of Cylinder Fourier Transform. Further more, a rectangular tunnel is taken for example to calculate coupling loss of LCX in the blind zone with the use of ray-tracing method. The material...
As an instrument to realize mobile communication in the blind zone, leaky coaxial cable (LCX) is recently widely used in communication systems of tunnels, mines, subways and so on. In this paper, beginning with the radiation theory of LCX and antenna, by the use of ray-tracing method, we take a tunnel for example to analyze its radiated field produced by both LCX and spiral antenna. By comparison,...
Starting from the basic electromagnetic theory, this paper theoretically analyses radiating modes of leaky coaxial cable (hereinafter LCX in short) and deduces mathematical expression of its radiating fields. We discuss how to restrain the high mode waves of radiating fields of LCX to expand its single mode radiating band based on the conditions which only single mode exists. After that we study a...
The path of electric waves of leaky coaxial cable (LCX) in the blind zone is analyzed in the ray-tracing method on the assumption that the bind zone is rectangular, and the distribution of the radiated field in the blind zone is calculated. Further, the effect of the period of the slots of LCX on the magnitude fluctuation is also discussed: a proper period can decrease the magnitude fluctuation of...
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