中波帯山頂送信における輻射及び伝搬特性の解析

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The propagation characteristic of the radio wave from transmitting station on the top of mountain has not been clarified though it is necessary to consider setting up the transmitting station in the mountain areas because of many reasons, such as electromagnetic envilonmental ploblems around antenna stations and huge cost and area for it. The researches on transmitting radio waves from the top of mountain are very few as far as the authors know. There are two main reasons. One is the difficulty of analytical estimation of radio wave propagation from transmitter to recievers along complex geographical features. The another reasion is the accepted explanation in broadcasting circles that the conductivity of mountain area is too low for efficient emission of radio wave. In this report, we try to overturn an established theory through analytical and experimental studies.The Furutsu's theory is applied to the analysis of propagation characteristic of the medium wave transmitted from the antenna on the top of a mountain. The mountains are modeled by the plateau of arbitrary hight with lower conductivity than those of plains. Numerical results thus obtained by our model are compared with the experimental results and well agree with those for the receiver far from antenna. Although the field strength measured at the foot of mountain is fairly lower than that estimated by the analysis, both results verify that the field strengths at the propagation distance are satisfactory for broadcasting purpose. An experimental verification is now beeing planned to verify the control of vertical radiation patterns from the antenna on the top of mountain.
愛媛大学の論文

中波帯山頂送信における輻射及び伝搬特性の解析

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