| Autor: |
Kalaagi, Mohammed, Seetharamdoo, Divitha |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 9/14/2019, Vol. 126 Issue 10, pN.PAG-N.PAG, 8p, 5 Diagrams, 1 Chart, 14 Graphs |
| Abstrakt: |
In this paper, a cascaded retrodirective metasurface is designed and demonstrated to operate simultaneously at a wide range of incident angles from − 30 ° to − 10 ° and 10 ° to 30 °. It is based on the design of several retrodirective super-cells following the generalized Snell's law of reflection, where each super-cell is designed to redirect an incoming wave back in the same direction with high efficiency. This metasurface is a very good candidate as a retroreflector for radar cross-section (RCS) enhancement of targets with poor backscattering. Retrodirective topologies have been a subject of interest, and several engineered topologies exist, such as the corner dihedral. Despite their good performances at a range of incident angles, their 3-dimensional bulky structure makes them hard to implement for different applications and they do not address extreme incident angles. The metasurface proposed can be a complementary solution to existing topologies for addressing extreme oblique incident angles while being more compact due to its two-dimensional subwavelength structure design. The monostatic radar cross-section (RCS) performance of the designed metasurface of dimensions 8.163 × 56.23 cm 2 has been compared to that of a conventional corner dihedral of dimensions 8 × 15.5 × 7.75 cm 3 , and a gain of up to 50 dB of monostatic radar cross section (RCS) in the ranges − 30 ° to − 20 ° and 20 ° to 30 ° was obtained. Comparable performances are observed in the ranges − 20 ° to − 10 ° and 10 ° to 20 ° between the designed metasurface and the corner dihedral. Experimental results are shown to be in good agreement with simulation results. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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