Abstract
A quaternionic metasurface consisting of two pairs of units with destructive phase difference is proposed to extend the bandwidth of radar cross section (RCS) reduction. The two pairs of units are designed to have complementary phase-different bandwidth, which extends the bandwidth of RCS reduction. The overlaps of their bandwidth enhance the RCS reduction, resulting in a metasurface having broadband and strong RCS reduction. This design and the wideband RCS reduction of the quaternionic metasurface were verified by analytical calculation with superposition principle of electric field, numerical simulation with commercial software package CST Microwave Studio and experiment in microwave anechoic chamber. The scattering mechanism and the angular performance of the quaternionic metasurface were also investigated.
Highlights
T.; Chen, S.; Li, W.; Guan, J.In recent years, metamaterials attract extensive research interests because of their brandnew electromagnetic mechanism, designable material parameters and powerful ability in controlling reflection, propagation, and absorption of electromagnetic waves [1,2,3,4]
With the normal incidence of electromagnetic waves, the monostatic radar cross section (RCS) reduction by a metasurface consisting with M × N units can be expressed as: M
Complementary phase difference wavebands is achieved by a quaternionic metasurface which is composed of two pairs of metasurface unit cells
Summary
T.; Chen, S.; Li, W.; Guan, J.In recent years, metamaterials attract extensive research interests because of their brandnew electromagnetic mechanism, designable material parameters and powerful ability in controlling reflection, propagation, and absorption of electromagnetic waves [1,2,3,4]. Metasurfaces are two-dimensional metamaterials which consist of sub-wavelength unit cells arranged in a plane in a periodical or deliberately disordered manner [5], offering extra advantages of low profile when inheriting the flexible design and outstanding performance of metamaterials [6]. Metamaterial absorbers usually show narrow working bandwidth that is not favored for many practical applications [16,17]. The pyramidal metamaterials, which are constructed by stacking tens of layers of size gradient resonant unit cells, can realize an absorption bandwidth comparable to that of the best-performing 1 mm thick traditional magnetic absorbers in the range of 8–18
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