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Directional emissions achieved with anomalous reflection phases of metamaterials
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10.1063/1.3289720
/content/aip/journal/jap/107/2/10.1063/1.3289720
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/2/10.1063/1.3289720
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic picture of the system studied in this paper. (b) Schematic picture of the QC metamaterial substrate and all the structure parameters are the same as Ref. 14. (c) Picture of the metallic cross structure adopted experimentally, with inset showing the unit cell structural details:, , , and . The metallic cross structure is deposited on a 1.5 mm-thick dielectric substrate with .

Image of FIG. 2.
FIG. 2.

(a) Reflection phase (in units of degrees) as a function of the incident angle (in units of degrees) with , obtained by FDTD simulations with frequency setting (blue open stars) and fitting with (red solid line). (b) Normalized H-plane radiation patterns of an 8 mm-long dipole antenna, obtained by the FDTD simulations (blue open stars) and GF method (red solid line), with frequency setting at .

Image of FIG. 3.
FIG. 3.

Return loss spectra for a monopole antenna put vertically on the center of the substrate, obtained by (a) FDTD simulations and (b) experiments. The arrow in (b) represents the working frequency of the directional emission. The antenna adopted in our experiments is a modified monopole antenna so that its length is hard to determine accurately, while the antenna adopted in FDTD simulations is 6mm long.

Image of FIG. 4.
FIG. 4.

FDTD calculated normalized (a) H-plane and (b) E-plane radiation patterns of a 6 mm-long monopole antenna put vertically on our metamaterial substrate sized (circles) and on a metallic ground plane of the same size (lines), with frequency setting at 9.0 GHz. Normalized (c) H-plane and (d) E-plane radiation patterns of a monopole antenna put vertically on our metamaterial substrate, obtained by FDTD simulations (circles), experiments (stars), and the GF method (dashed-dotted lines), with frequency setting at 10.04 GHz.

Image of FIG. 5.
FIG. 5.

Reflection phase (in units of degrees) as a function of the azimuth angle (in units of degrees) with , obtained by FDTD simulations at frequencies (stars) and (circles).

Image of FIG. 6.
FIG. 6.

Normalized H-plane radiation pattern of a 6 mm-long monopole antenna put vertically on a modified metamaterial ground plane with structural details , , , and , obtained by FDTD simulations with frequency setting at 27.6 GHz. Here, we set according to the E-plane result.

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/content/aip/journal/jap/107/2/10.1063/1.3289720
2010-01-28
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Directional emissions achieved with anomalous reflection phases of metamaterials
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/2/10.1063/1.3289720
10.1063/1.3289720
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