期刊
JOURNAL OF OPTICS
卷 20, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2040-8986/aaacbf
关键词
broadband; metamaterial; lens; fan-shaped beam; high gain; high aperture efficiency; gradient index of refraction
类别
资金
- National Natural Science Foundation of China [61138001, 61302018, 61401089, 61401091, 61571117, 61501112, 61501117]
- 111 Project [111-2-05]
A new method is proposed to design gradient refractive-index metamaterial lens antennas by optimizing both the refractive-index distribution of the lens and the feed directivity. Comparing to the conventional design methods, source optimization provides a new degree of freedom to control aperture fields effectively. To demonstrate this method, two lenses with special properties based on this method are designed, to emit high-efficiency plane waves and fan-shaped beams, respectively. Both lenses have good performance and wide frequency band from 12 to 18 GHz, verifying the validity of the proposed method. The plane-wave emitting lens realized a high aperture efficiency of 75%, and the fan-beam lens achieved a high gain of 15 dB over board bandwidth. The experimental results have good agreement with the design targets and full-wave simulations.
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