High-performance lens antenna using high refractive index metamaterials

doi:10.1088/1674-1056/27/8/087802

Abstract In this paper, a high refractive index metamaterial (HRM), whose element is composed of bilayer square patch (BSP) spaced by a dielectric plate, is proposed. By reducing the thickness of the dielectric plate and the gap between adjacent patches, the BSP can effectively enhance capacitive coupling and simultaneously suppress diamagnetic response, which significantly increases the refractive index of the proposed metamaterial. Furthermore, the high refractive index region is far away from the resonant region of the metamaterial, resulting in broadband. Based on these characteristics of BSP, a gradient refractive index (GRIN) lens with thin thickness (0.34λ₀, where λ₀ is the wavelength at 5.75 GHz) is designed. By using this lens, we then design a circularly polarized horn antenna with high performance. The measurement results show that the 3-dB axial ratio bandwidth is 34.8% (4.75 GHz~6.75 GHz) and the antenna gain in this frequency range is increased by an average value of 3.4 dB. The proposed method opens up a new avenue to design high-performance antenna.

Keywords: circularly polarized horn antenna high refractive index lens metamaterial.

Received: 12 December 2017
Revised: 04 May 2018
Accepted manuscript online:

PACS:	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)
	84.40.Ba	(Antennas: theory, components and accessories)
	84.90.+a	(Other topics in electronics, radiowave and microwave technology, and direct energy conversion and storage)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61761010 and 61461016), in part by the Natural Science Foundation of Guangxi Zhuang Autonomous Region, China (Grant No. 2015jjBB7002), in part by the Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, and in part by the Innovation Project of GUET Graduate Education (Grant No. 2018JCX24).

Corresponding Authors: Xi Gao
E-mail: gao_xi76@163.com

Cite this article:

Lai-Jun Wang(王来军), Qiao-Hong Chen(陈巧红), Fa-Long Yu(余发龙), Xi Gao(高喜) High-performance lens antenna using high refractive index metamaterials 2018 Chin. Phys. B 27 087802

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