Abstract
Because Pancharatnam-Berry (PB) geometrical phase can only be generated in the co-polarized reflection coefficient under circular polarized (CP) incidence for a reflective metasurface, the design of a reflective PB coding metasurface must be based on an appropriate polarization conversion metasurface (PCM) which can achieve CP-maintaining reflection. In this work, to design a reflective 2-dit PB coding metasurface for radar cross section (RCS) reduction, an ultra-wideband PCM is proposed at first, numerical simulation shows that the PCM can realize ultra-wideband CP-maintaining reflection from 8.6 to 35.9 GHz; moreover, PB phase will be generated in its co-polarized reflection coefficient under CP incidence by rotating its unit structure. Thus, an ultra-wideband reflective 2-dit PB coding metasurface is constructed successfully based on the PCM. The simulation and experiment results show that the coding metasurface has excellent performance in RCS reduction under arbitrary polarized incidences, compared with a pure metallic plate with the same size, its RCS can be reduced more than 10 dB in the frequency band 8.2–35.2 GHz with a relative bandwidth of 124.4%, in addition, the RCS reduction performance is kept well when the incident angle is increased to 45°.
Highlights
Metasurfaces are two-dimensional planar metamaterials with ultrathin thickness, which usually consist of a planar array of sub-wavelength resonant unit cell structures
A chessboardlike metasurface composed of artificial magnetic conductors (AMC) and perfect electronic conductor (PEC) was firstly proposed by Panquay et al in 2007 [8], whose radar cross section (RCS) was reduced because of the cancellation effects arising from the 180° reflection phase difference between PEC and AMC, but
The fabricated prototype has been measured using free-space measurement techniques, it has been measured under right-handed CP (RCP) and LP normal incidences and oblique incidences with incident angle of 45°
Summary
Metasurfaces are two-dimensional planar metamaterials with ultrathin thickness, which usually consist of a planar array of sub-wavelength resonant unit cell structures. Through reasonable design of the resonant unit cell structures, almost all basic properties of electromagnetic (EM) waves can be tailored by various metasurfaces. To reduce the RCS of stealth targets by using metasurfaces, there are two commonly used methods: one is absorption, and the other is phase cancellation. A chessboardlike metasurface composed of artificial magnetic conductors (AMC) and perfect electronic conductor (PEC) was firstly proposed by Panquay et al in 2007 [8], whose RCS was reduced because of the cancellation effects arising from the 180° reflection phase difference between PEC and AMC, but
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