矩形反射柱体近旁天线辐射特性的计算应用几何绕射理论
CALCULATION OF THE RADIATION CHARACTERISTICS OF ANTENNAS ADJACENT TO A RECTANGULAR CYLINDER REFELECTOR BY GTD
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摘要: 本文用几何绕射理论分析计算了矩形反射柱体近旁偶极子和双环天线的水平辐射特性。研究了到达场点的直达波、反射波和柱体稜边各次绕射波之间的量值关系。分析了柱体边长、天线与柱体之间的相对位置和天线的馈电方式对合成场强方向图的影响。计算结果表明,需要对天线系统的有关参数进行优化设计,以得到最佳的全向辐射特性,本文的分析方法和结果为这类天线系统的优化设计提供了手段和依据。
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Abstract: In this paper, the horizontal radiation characteristics of dipole and loop antennas adjaeent to a rectangular cylinder reflector are calculated by the application of GTD. The magnitudes of the direct field, the reflected field and the diffracted field from the edges of the cylinder at the field point are calculated and compared. The effects of the dimension of the cylinder, of the relative position of the antennas with respect to the cylinder and of the method of feeding to the resultant field pattern are analyzed. Using the method described, optimum design can be carried out to obtain the optimum omnidireetional radiation charqacteristics of antennas with reflector of this kind. -
逺藤敬二等,アンテナエ学,日刊工業新聞社,東京,1969.[2]G. L. James, Geometrical Theory of Diffraction for Electromagnetic Waves, Peter Peregrinus Ltd.,Stevenage, UK and New York, 1977, pp. 115-159.[3]R. G. Kouyoumjian, The Geometrical Theory of Diffraction and Its Application, in Numerical and Asymptotic Techniques Electromagnetics, ed. by R. Mittra, Springer-Verlag Berlin, Heidelberg, New York, 1975, pp. 166-217.[4]R. G. Kouyoumjian and P. H. Pathak, Proc. IEEE, 62(1974), 1448.[5]H. Bach, Engineering Application of the Geometrical Theory of Diffraction, in Modern Topics in Electromagnetics and Antennas, ed. by E. J. Maanders and R. Mittra, Peter Peregrinus Ltd., Stevenage, England, 1977, pp. 5.1-5.87. -
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