Wideband Transmitarray With Reduced Profile
Wideband Transmitarray With Reduced Profile
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DOI：
10.1109/lawp.2018.2794605
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发表时间：
2018-03-01
影响因子：
4.2
通讯作者：
Yang, Xuexia
中科院分区：
文献类型：
--
作者：
Luo, Qi;Gao, Steven;Yang, Xuexia
本文介绍了一种宽带低剖面发射阵列。提出了一种基于宽带带通滤波器的新型单元结构，并将其应用于TA的设计。TA由两个相同的三层频率选择表面（FSS）组成，因此与使用至少四个由四分之一波长气隙隔开的FSS层以获得360 °的传统设计相比，它具有更低的轮廓。相移范围该结构在顶层和底层各印制一对方形贴片，在中间层印制一个由四条微带线加载的方形缝隙。通过同时调整方形贴片的尺寸来实现相移。在感兴趣的频带内，所开发的单位单元显示出低插入损耗和足够的相移范围。一个等效电路模型的开发，以更好地理解的工作原理的频率选择表面。为了验证设计概念，一个原型工作在13.5 GHz的设计，制造和测量。测试结果表明，所设计的TA获得了16%的1dB增益带宽和60%的孔径效率。所开发的单元电池具有对称的配置，因此它也可以应用于双极化或圆极化TA的设计。
This letter presents a wideband transmitarray (TA) with reduced profile. A novel unit cell based on a wideband bandpass filter is developed and applied to the design of the TA. The TA consists of two identical trilayer frequency selective surfaces (FSSs), thus it has a lower profile compared to traditional designs that use at least four FSS layers separated by quarter-wavelength air gaps to obtain the 360. phase shift range. The FSS has a pair of square patches printed on the top and bottom layers, and a square slot loaded by four microstrip lines printed on the middle layer. The phase shift is achieved by simultaneously adjusting the size of the square patches. Within the frequency band of interest, the developed unit cell shows low insertion loss and sufficient phase shift range. An equivalent circuit model is developed to better understand the operating principles of the FSS. To validate the design concept, one prototype operating at 13.5 GHz is designed, fabricated, and measured. The measurement results show that the designed TA achieves 16% 1 dB gain bandwidth and 60% aperture efficiency. The developed unit cell has symmetric configurations so it can also be applied to the design of dual-polarized or circularly polarized TAs.