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首页> 外文期刊>Electrical Engineers - Part III: Radio and Communication Engineering, Journal of the Institution of >The Theoretical Precision with which an Arbitrary Radiation-Pattern may be Obtained from a Source of Finite Size
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The Theoretical Precision with which an Arbitrary Radiation-Pattern may be Obtained from a Source of Finite Size

机译：可从有限尺寸的源获得任意辐射图的理论精度

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摘要

It appears that it is possible to approximate as closely as desired to a specified radiation-pattern by a suitable distribution of field over an aperture of given size, though the necessary currents in the conducting elements of the source would in general be prohibitively large in comparison with the power radiated. The difficulty of obtaining a high degree of approximation, and in particular a power gain very much greater than that of a uniformly illuminated aperture, is thus a practical rather than a theoretical one. The same is true for the linear array of given length as for the continuous aperture if no limit is set to the number of elements. Even when this number is limited by the adoption of half-wavelength spacing, the broadside power gain is not a maximum when the amplitudes and phases of the elements are equal, unless the elements are ideal isotropic point-sources.
机译：似乎可以通过在给定尺寸的孔上适当分布电场来接近指定的辐射图，尽管该源的导电元件中的必要电流通常相比而言会过大。随着辐射的力量。因此，获得高度近似度的困难，尤其是获得比均匀照明的孔径大得多的功率增益的困难，是实际的而不是理论上的。如果对元素数没有限制，则给定长度的线性阵列与连续孔径的情况相同。即使当这个数目受到采用半波长间隔的限制时，除非元件是理想的各向同性点源，否则当元件的幅度和相位相等时，宽边功率增益也不是最大。

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