期刊
APPLIED PHYSICS LETTERS
卷 110, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4984219
关键词
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资金
- National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396]
- LDRD program, Los Alamos National Laboratory
We demonstrate a metasurface-based ultrathin flat lens operating at microwave frequencies. A series of subwavelength metallic split-ring resonators, which are sandwiched between two cross-polarized metallic gratings, are defined to obtain a radially symmetric parabolic phase distribution, covering relative phase differences ranging from 0 to 2.5 pi radians to create a lens. The tri-layer lens exhibits focusing/collimating of broadband microwaves from 7.0 to 10.0 GHz, with a gain enhancement of 17 dBi at a central wavelength 9.0GHz while fed by a rectangular horn antenna. The measured focal length agrees reasonably well with design, achieving a 3 dB directionality <4.5 degrees and confirming high-quality beam collimation along the propagation direction. The demonstrated metasurface flat lens enables light-weight, low-cost, and easily deployable flat transceivers for microwave communication, detection, and imaging applications. Published by AIP Publishing.
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