International Symposium on Antennas and Propagation
High-Frequency Solution for Ground Wave Propagation along Land-to-Sea Mixed-Path
Toru Kawano, Keiji Goto, Toyohiko Ishihara,
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When the surface impedance of the earth along the propagation direction changes abruptly, the ground wave is strongly affected as it occurs when the radio wave traverses a coastline from the land to the sea -. In this study, we shall obtain the integral representation for the ground wave propagation over the land-to-sea mixed-path by applying the aperture field method. Then by applying the high-frequency analysis method in evaluating the integral, we will obtain the asymptotic solution for the land-to-sea mixed-path ground wave propagation. In order to verify the validity of the high-frequency asymptotic solution, we will compare the asymptotic solution both with the mixed-path theory , ,  ?  and the experimental results ,  ? . By examining the asymptotic solution in detail, we will find out the cause of the recovery effect  occurring on the sea over the land-to-sea mixed-path propagation.