ABSTRACT

Antenna arrays with low sidelobe patterns and high directivities are very desirable in practice and represent a key success for many communication systems such as radio telescopes, satellites, fifth-generation (5G) wireless communication systems, and high detection radars. To meet these features, a new array pattern synthesis method based on two uniformly sub-arrays controlled by a pre-specified power factor is presented. The proposed method includes the following steps: first, the outputs of those two scanned sub-arrays are added and subtracted to generate the sum and difference patterns, respectively. The sidelobe structures of these two generated patterns are nearly identical, then, an array pattern with greatly reduced sidelobes and narrowed beam width can be obtained by simply subtracting the difference pattern from the sum pattern. Simulation results show that the proposed array pattern with power factor, e = 0.5, can provide a sidelobe level about −32 dB (i.e. an improvement about −19 dB with compared to that of the corresponding fully uniform array). Moreover, the beam width of the proposed array has been greatly narrowed. Better results can be also obtained by controlling the scanned angles of the two sub-arrays.

摘要

在实践中非常需要具有低旁瓣模式和高方向性的天线阵列，它们代表了许多通信系统（如射电望远镜，卫星，第五代（5G）无线通信系统和高探测雷达）的关键成功。为了满足这些特征，提出了一种新的基于两个由预定功率因数控制的均匀子阵列的阵列图形合成方法。所提出的方法包括以下步骤：首先，将这两个扫描的子阵列的输出相加和相减以分别产生和模式和差模式。这两个产生的图案的旁瓣结构几乎相同，因此，可以通过简单地从求和图案中减去差图案来获得具有大大减小的旁瓣和狭窄的波束宽度的阵列图案。e  = 0.5，可以提供约-32 dB的旁瓣电平（即与相应的完全均匀阵列相比，旁瓣电平提高约-19 dB）。而且，所提出的阵列的光束宽度已经大大缩小。通过控制两个子阵列的扫描角度，也可以获得更好的结果。