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本文借助计算机,找到了相控阵天线方向图凹陷92分贝的盲点,其对应电导小到3×10~(-9)。从而以数字结果验证了文献[3]有关盲点机理的结论。文中给出了三角栅格H平面扫描情况下导纳变化的生动景象,讨论了在不同扫描角求导纳时应选取的波导模数目。并且发现盲点位置与所取波导模数目有关;还指出了文献[7]关于这一问题论述的局限性。本文所用互导纳公式物理概念清晰,矢量模函数Fourier变换简明,最后在附录里给出了用ALGOL-60语言对导纳公式编制的源程序。
In this paper, a blind spot of 92 dB depression of the phased array antenna pattern is found with the help of a computer, and its corresponding conductance is as small as 3 × 10 -9. The results of the blind spot in literature [3] are verified by numerical results. In this paper, we present the vivid scene of admittance changes in the triangular grid H-plane scanning, and discuss the number of waveguide modes that should be selected when admittance is satisfied at different scanning angles. And found that the location of the blind spot is related to the number of guided modes. The limitations of the literature [7] on this issue are also pointed out. In this paper, the physical concept of mutual admittance equation used is clear, and the Fourier transform of vector modulus function is concise. Finally, the source program of admittance formula written by ALGOL-60 language is given in the appendix.