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Stacked complementary metasurfaces for ultraslow microwave metamaterials
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Image of FIG. 1.
FIG. 1.

Picture of the fabricated prototype. The front layer is a complementary-split-ring-resonators metasurface. Inset: unit cell with its parameters.

Image of FIG. 2.
FIG. 2.

Dispersion diagram of the infinite stack of alternative split-ring-resonators-metasurfaces and complementary-split-ring-resonator-metasurfaces. The inset shows the unit cell along with the polarization of the incident electromagnetic wave.

Image of FIG. 3.
FIG. 3.

Transmission coefficient through a stack of 1, 2, and 3 functional layers: measurements (solid lines) and numerical calculations (dashed lines). Arrows point out experimental maxima at each transmission band and for each number of functional layers.

Image of FIG. 4.
FIG. 4.

Experimental group delay as a function of the number of functional layers for the first (a) and second propagating band (b). Arrows indicate the peak frequencies for each number of stacked functional layers, which correlate with those arrows plotted in Fig. 3.


Generic image for table
Table I.

Group delay at the frequency of the maximum transmittance for each number of stacked functional layers normalized to the group delay of an electromagnetic wave propagating in free-space the same thickness of the stack.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stacked complementary metasurfaces for ultraslow microwave metamaterials