In this study, a single layer reflectarray antenna is proposed with variable patch sized unit cells and suggested for enhancing the bandwidth with small overall dimensions for X‐band applications. The novel unit cell consists of double cutted ring geometry. 13 × 13 unit cells reflectarray is covering an 162.5 × 162.5 mm² ultrathin square substrate with ε_r = 6.15 dielectric permittivity and 0.042 × λ₀ thickness. In order to obtain larger and smoother phase curve, 2 mm air gap is inserted between substrate and ground plane. The required phase delay is compensated by using variable size unit cell elements. The main beam is directed to the desired direction (θ = 0°). A 169‐elements reflectarray is illuminated by a pyramidal horn antenna which is located at F = 148 mm. The designed reflectarray antenna is simulated and fabricated to validate the design method. The measurements are made in a shielded anechoic chamber. The simulation and measurement results are in agreement with each other. The maximum gain value is 22.93 dBi at 12 GHz, 1‐dB gain bandwidth is 18% between 10 and 12 GHz and 3‐dB gain bandwidth is 24% between 9.4 and 12 GHz.

中文翻译：

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具有X波段应用的双切口环形元件的Reflectarray天线设计

在这项研究中，提出了一种具有可变贴片大小的单位单元的单层反射阵列天线，并建议以较小的整体尺寸来增强带宽，以用于X波段应用。新颖的晶胞由双切环几何形状组成。13×13的单元电池反射阵列被覆盖的162.5×162.5毫米²超薄方形基板与ε _{- [R} = 6.15介电常数和0.042×  λ ₀的厚度。为了获得更大，更平滑的相位曲线，在基板和接地层之间插入了2 mm的气隙。所需的相位延迟通过使用可变大小的单位单元元素来补偿。主光束指向所需方向（θ= 0°）。169个元素的反射阵列由位于F = 148 mm的角锥天线照射。仿真并设计了设计的反射阵列天线，以验证设计方法。在屏蔽消声室中进行测量。仿真和测量结果彼此一致。在12 GHz时最大增益值为22.93 dBi，在10和12 GHz之间1 dB增益带宽为18％，在9.4和12 GHz之间3 dB增益带宽为24％。