Abstract
THE transmitting aerial of a broadcasting station designed for local or national service should confine as much as possible of its radiated energy to the horizontal direction, emitting as little as possible in directions making an angle of less than 60 ° with the vertical. The station will then have a large service area in which little fading is experienced. The demand for information on the design of such an aerial has given rise in recent years to some theoretical and experimental investigations on the general properties of antennas used in radio transmitting stations. A new and useful contribution to the state of knowledge on this subject has recently been given by Prof. P. O. Pcdersen in a booklet published (in English) in Copenhagen (“Radiation from a Vertical Antenna over Flat Perfectly Conducting Earth.” Pp. 49 + 35 figures. G. E. C. Gad: Vimmelskaftet 32, Copenhagen. Kr. 6.00). This work comprises a theoretical investigation of the radiation characteristics of a vertical antenna over Hat perfectly conducting earth, having for its objective a determination of the most suitable dimensions of the antenna at the new Copenhagen broadcasting station. The theoretical results have been checked by measurements of the distribution of the current in the antenna and of the field intensity at various distances from the station. To facilitate the theoretical analysis, the current distribution in the transmitting antenna is in the first case assumed to be sinusoidal, although it was known that this is not valid in the practical case. The complete general formulas for the radiated field for an antenna are obtained, and a most useful series of tables and graphs are provided, from which the radiation resistance and the distribution of the radiated field in the vertical plane may be calculated for antenna; of various dimensions.
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Radiation from a Transmitting Aerial. Nature 136, 270 (1935). https://doi.org/10.1038/136270a0
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DOI: https://doi.org/10.1038/136270a0