Achievement of beam steering in terahertz band based on frequency-scanning grating-reflector antenna
Achievement of beam steering in terahertz band based on frequency-scanning grating-reflector antenna
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DOI：
10.1049/el.2013.3708
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发表时间：
2014-01
影响因子：
1.1
通讯作者：
Shichao Li;C. Li;Xiaojuan Zhang;G. Fang
中科院分区：
文献类型：
--
作者：
Shichao Li;C. Li;Xiaojuan Zhang;G. Fang
提出了一种工作在0.2THz波段的频率扫描光栅反射面天线。该天线系统由平面光栅反射器、薄透镜和置于透镜焦点处的馈电喇叭组成。基于Floquet定理，对基于扫频的波束扫描特性进行了分析和优化。为了提高衍射效率和抑制镜面反射光束，引入了双层结构。通过0.2THz波段的准光学测量验证了频率控制光束转向的概念。在180-220 GHz频段上，测量的扫描范围为13.55°。衍射效率高达89%以上，镜面光束得到了显著抑制。所提出的天线的优点是方便扩展到更高的频率，具有高的方向性。
A frequency-scanning grating-reflector antenna operating in the 0.2 THz band is proposed. The antenna system consists of a planar grating reflector, a thin lens and a feed horn placed at the focal point of the lens. The beam-scanning property based on the frequency sweeping was analysed and optimised based on Floquet's theorem. A bilayer structure is introduced to improve the diffraction efficiency and to suppress the specular beam. The frequency-controlled beam steering concept was verified by the quasi-optical measurements in the 0.2 THz band. The measured scanning range is 13.55° over the frequency band 180–220 GHz. The specular beams are remarkably inhibited with the diffractive efficiency as high as over 89%. The presented antenna has the advantage of the convenience to be extended to a higher frequency with a high directivity.