Fully Metallic Flat Lens Based on Locally Twist-Symmetric Array of Complementary Split-Ring Resonators

被引:15
作者
Dahlberg, Oskar [1 ]
Valerio, Guido [2 ]
Quevedo-Teruel, Oscar [1 ]
机构
[1] KTH Royal Inst Technol, Div Electromagnet Engn, S-10044 Stockholm, Sweden
[2] Sorbonne Univ, Lab Elect & Electromagnetisme, F-75005 Paris, France
来源
SYMMETRY-BASEL | 2019年 / 11卷 / 04期
关键词
twist symmetry; lens antenna; complementary split-ring resonator; complementary split ring resonator (CSRR); WAVE-GUIDE; 5G COMMUNICATIONS; TRANSMIT-ARRAY; PROPAGATION;
D O I
10.3390/sym11040581
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In this article, we demonstrate how twist symmetries can be employed in the design of flat lenses. A lens design is proposed, consisting of 13 perforated metallic sheets separated by an air gap. The perforation in the metal is a two-dimensional array of complementary split-ring resonators. In this specific design, the twist symmetry is local, as it is only applied to the unit cell of the array. Moreover, the twist symmetry is an approximation, as it is only applied to part of the unit cell. First, we demonstrate that, by varying the order of twist symmetry, the phase delay experienced by a wave propagating through the array can be accurately controlled. Secondly, a lens is designed by tailoring the unit cells throughout the aperture of the lens in order to obtain the desired phase delay. Simulation and measurement results demonstrate that the lens successfully transforms a spherical wave emanating from the focal point into a plane wave at the opposite side of the lens. The demonstrated concepts find application in future wireless communication networks where fully-metallic directive antennas are desired.
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页数:8
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