Single-layer broadband planar antenna using ultrathin high-efficiency focusing metasurfaces

doi:10.1088/1674-1056/26/5/057701

Abstract Phase gradient metasurfaces (PGMS) offer a fascinating ability to control the amplitude and phase of the electromagnetic (EM) waves on a subwavelength scale, resulting in new applications of designing novel microwave devices with improved performances. In this paper, a reflective symmetrical element, consisting of orthogonally I-shaped structures, has been demonstrated with an approximately parallel phase response from 15 GHz to 22 GHz, which results in an interesting wideband property. For practical design, a planar antenna is implemented by a well-optimized focusing metasurface and excited by a self-designed Vivaldi antenna at the focus. Numerical and experimental results coincide well. The planar antenna has a series of merits such as a wide 3-dB gain bandwidth of 15-22 GHz, an average gain enhancement of 16 dB, a comparable aperture efficiency of better than 45% at 18 GHz, and also a simple fabrication process. The proposed reflective metasurface opens up a new avenue to design wideband microwave devices.

Keywords: phase gradient metasurfaces ultrathin broadband focusing

Received: 09 October 2016
Revised: 07 December 2016
Accepted manuscript online:

PACS:	77.22.-d	(Dielectric properties of solids and liquids)
	73.61.-r	(Electrical properties of specific thin films)
	84.90.+a	(Other topics in electronics, radiowave and microwave technology, and direct energy conversion and storage)
	77.22.-d	(Dielectric properties of solids and liquids)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61372034).

Corresponding Authors: Guang-Ming Wang, Tong Cai
E-mail: wgming01@sina.com;caitong326@sina.cn

Cite this article:

Hai-Sheng Hou(侯海生), Guang-Ming Wang(王光明), Hai-Peng Li(李海鹏), Wen-Long Guo(郭文龙), Tang-jing Li(李唐景), Tong Cai(蔡通) Single-layer broadband planar antenna using ultrathin high-efficiency focusing metasurfaces 2017 Chin. Phys. B 26 057701

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Single-layer broadband planar antenna using ultrathin high-efficiency focusing metasurfaces

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