Plane-wave scattering by metallic grating with artificial anisotropic substrate is a problem solved in this study for the design of broadband reflectarrays. For determination of the reflection characteristics of such structures, a generalised transmission line modelling is used for evaluating the dyadic Green's function. This function is utilised in a summation equation used for calculating the induced electric currents on the reflectarray's metallic grating. For solving the obtained summation equation, the Periodic Method of Moments with Galerkin procedure is applied. Such an analysis method helps to compute the phase diagram needed to design of reflectarray. The efficiency of this method is assessed by considering its cost-time and rate of convergence versus space harmonics. In the design step, a new phase realisation approach is implemented for minimising the frequency dispersion's adverse effects. This approach optimises the arrangement of metallic elements on the reflectarray's aperture and decreases the dependency of broadband reflectarray design to the element phase behaviour. As a result, this technique leads to lower side lobe level and better frequency response than traditional approaches. To verify the results of the developed solution, two different broadband reflectarrays for X- and Ku-bands are fabricated and measured.

中文翻译：

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各向同性/人造各向异性宽带反射阵列的高效分析方法和设计方法

带有人工各向异性基底的金属光栅对平面波的散射是本研究解决宽带反射阵列设计的一个问题。为了确定这种结构的反射特性，使用通用的传输线建模来评估二进格林函数。该函数用于求和公式中，该求和公式用于计算反射阵列的金属光栅上的感应电流。为了求解获得的求和方程，应用具有Galerkin程序的矩矩周期法。这种分析方法有助于计算设计反射阵列所需的相图。该方法的效率通过考虑其成本时间和收敛速度与空间谐波的关系来评估。在设计步骤中，实施了一种新的相位实现方法，以最小化频率色散的不利影响。这种方法优化了金属元素在反射阵列孔径上的排列，并减少了宽带反射阵列设计对元件相位行为的依赖性。结果，与传统方法相比，该技术导致较低的旁瓣电平和更好的频率响应。为了验证所开发解决方案的结果，制造并测量了两个不同的X波段和Ku波段宽带反射阵列。与传统方法相比，此技术可导致较低的旁瓣电平和更好的频率响应。为了验证所开发解决方案的结果，制造并测量了两个不同的X波段和Ku波段宽带反射阵列。与传统方法相比，此技术可导致较低的旁瓣电平和更好的频率响应。为了验证所开发解决方案的结果，制造并测量了两个不同的X波段和Ku波段宽带反射阵列。