Design and Experimental Realization of a Broadband Transformation Media Field Rotator at Microwave Frequencies

Abstract

We designed a metamaterial field rotator that can rotate electromagnetic wave fronts. Our starting point was the transformation-media concept. Effective medium theories and full simulations facilitated the actual design process. We created at a very simple structure comprising of an array of identical aluminum metal plates. We made and measured a sample and we experimentally demonstrated the field rotation effect as well as the broadband functionality at microwave frequencies.

Three-dimensional broadband and broad-angle transformation-optics lens

“…In the design of the new 3D lens, transformation optics has an important role. It has been widely used to design and generate other attractive devices such as invisibility cloaks [5][6][7][8][9][10][11][12][13][14][15][16] , electromagnetic concentrators and rotators [17][18][19] and high-performance antennas 20,21 . To design the 3D Luneburgbased lens, we start from a 2D geometry shown in Figure 1.…”

A simple design of an artificial electromagnetic black hole

“…Their related permittivities in microwave frequencies (near 10 GHz) are about ǫ P E = 2.3, ǫ P MMA = 2.6, and ǫ P V DF = 7 + 0.7i 24 (Note that ǫ air = 1 and ǫ Al = −∞ 9 ). As the equal thickness of each layer is 5mm, we divide each layer into cells each measuring 5mm in the middle so that each cell has "fanlike" shape 9 . A cylinder with one kind of materials is placed in the center of each cell and embedded in a background material.…”

Study and analysis of an electric Z-shaped meta-atom

“…Metamaterials offer remarkable properties that go beyond conventional natural materials and are actually used in novel class electromagnetic devices such as invisibility cloaks [1][2][3][4][5], rotators [6], retroreflectors [7], Luneburg lenses [8], waveguide tapers [9] and directive antennas [10][11][12][13][14][15][16][17]. A typical metamaterial is an artificially engineered structure made of a periodic array of sub wavelength metallic or dielectric inclusions called meta-atoms.…”