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	A BROADBAND SLAB LENS ANTENNA FORMED FROM GRADIENT REFRACTIVE INDEX METAMATERIALS COMPOSED OF CROSS- SHAPED CELLS
	Yuan, Guishan1,2; Dong, Xiaochun1,2; Deng, Qiling1; Liu, Chunheng1; Lu, Yueguang1; Shi, Haofei2; Du, Chunlei2
	2014-05-01
摘要	A slab lens antenna has been designed to enhance the directivity of a horn antenna efficiently in a wide range of frequencies. A gradient refractive index metamaterial is utilized to compensate phases of electromagnetic waves radiated from a horn, which can transform the cylindrical wave into a plane wave. To obtain broadband property, the gradient refractive index metamaterial composed of cross-shaped conductor, which works in a nonresonant status is designed, and the metamaterial is proved to be broadband, polarization insensitive, and lossless. The slab lens is designed by a collection of metamaterial unit cells with different geometric parameters, where the effective refractive index of the unit cells are determined by the size of cross-shaped conductors to form the required inhomogeneous refractive index distribution. The simulation and experiment results show that the lens located in front of a horn can considerably compress the antenna's radiation patterns over a wide band range from 12 to 18 GHz. (c) 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1124-1129, 2014
关键词	lens antenna metamaterial broadband antennas
DOI	10.1002/mop.28279
发表期刊	MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
ISSN	0895-2477
卷号	56期号:5页码:1124-1129
通讯作者	Shi, HF (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 401122, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000332519500028
语种	英语