Soliman Shimaa A M, Eldesouki Eman M, Attiya Ahmed M
Microwave Engineering Department, Electronics Research Institute, Joseph Tito St., Huckstep, El Nozha, Cairo 11843, Egypt.
Sensors (Basel). 2022 Feb 3;22(3):1166. doi: 10.3390/s22031166.
This paper presents the analysis and design of an X-band reflectarray. The proposed antenna can be used for a medium Earth orbit (MEO) remote sensing satellite system in the 8.5 GHz band. To obtain a nearly constant response along the coverage area of this satellite system, the proposed antenna was designed with a flat-top radiation pattern with a beam width of around 29° for the required MEO system. In addition, broadside pencil beam and tilted pencil beam reflectarrays were also investigated. The feeding element of the proposed reflectarray antennas is a Yagi-Uda array. The amplitude and phase distribution of the fields due to the feeding element on the aperture of the reflectarray antenna are obtained directly by numerical simulation without introducing any approximation. The required phase distribution along the aperture of the reflectarray to obtain the required flat-top radiation pattern is obtained using the genetic algorithm (GA) optimization method. The reflecting elements of the reflectarray are composed of stacked circular patches. This stacked configuration was found to be appropriate for obtaining a wide range of reflection phase shift, which is required to implement the required phase distribution on the reflectarray aperture. The antenna was fabricated and measured for verification.
本文介绍了一种X波段反射阵列的分析与设计。所提出的天线可用于8.5GHz频段的中地球轨道（MEO）遥感卫星系统。为了在该卫星系统的覆盖区域内获得近乎恒定的响应，所提出的天线针对所需的MEO系统设计了具有约29°波束宽度的平顶辐射方向图。此外，还研究了宽边笔形波束和倾斜笔形波束反射阵列。所提出的反射阵列天线的馈电元件是八木-宇田阵列。通过数值模拟直接获得馈电元件在反射阵列天线孔径上产生的场的幅度和相位分布，而无需引入任何近似。使用遗传算法（GA）优化方法获得沿反射阵列孔径所需的相位分布，以获得所需的平顶辐射方向图。反射阵列的反射元件由堆叠的圆形贴片组成。发现这种堆叠结构适合于获得实现反射阵列孔径上所需相位分布所需的宽范围反射相移。该天线已制作并进行了测量以进行验证。
