A wideband microstrip reflectarray antenna (RA) is proposed using a novel unit‐cell for X‐band applications. The unit‐cell is composed of a logarithmic toothed microstrip element and two‐variable phase‐delay lines (PDLs) for the required phase compensation in the RA. By adjusting the lengths of the PDLs, a smooth and almost linear phase variations of 627° is achieved at the frequency of 10 GHz. Based on the proposed element, a 144‐element center‐fed RA with dimensions of 216 mm × 216 mm is designed at 10 GHz and simulated using CST software. Then, a fabricated prototype RA is tested to validate the design approach. The maximum measured gain is 25.3 dB at 10.4 GHz, whereas the gain is 24.6 dB with 44.2% aperture efficiency at the design frequency of 10 GHz. Also, the measured gain frequency characteristic shows the 1 and 3‐dB gain bandwidths of 24.8% and 42.3%, respectively, and the measured radiation patterns verify the simulated ones as well.

中文翻译：

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使用对数贴片元件的宽带反射阵列天线

针对X波段应用，提出了一种使用新型单位单元的宽带微带反射阵列天线（RA）。晶胞由对数带齿微带线元件和两个可变相位延迟线（PDL）组成，用于RA中所需的相位补偿。通过调整PDL的长度，可以在10 GHz的频率上实现627°的平滑且几乎线性的相位变化。根据提出的元素，设计了144元素中心馈送的RA，尺寸为216 mm×216 mm，并在10 GHz频率下进行了仿真，并使用CST软件进行了仿真。然后，对预制的原型RA进行测试以验证设计方法。在10.4 GHz时，最大测量增益为25.3 dB，而在10 GHz设计频率下，孔径效率为44.2％时，增益为24.6 dB。同样，测得的增益频率特性显示出1和3 dB的增益带宽为24。