Abstract
We present a single-layer metasurface, which performs both cross and circular polarization conversion at multiple frequency bands. The unit cell of the proposed metasurface consists of periodic array of a uniquely designed hexagonal split ring resonator (SRR). The proposed metasurface behaves as an efficient 90° polarization rotator at dual frequency bands of 6.36-6.59 GHz and 10.54-13.56 GHz. The polarization conversion efficiency approaches 90% within these two operating bands. Moreover, linear-to-circular polarization conversion is also achieved in other three wide frequency bands from 6.10-6.20 GHz, 6.84-9.02 GHz and 14.10-15.48 GHz. The novel features of the subject hexagonal metasurface, which qualify it for numerous practical applications are high cross-polarization conversion (CPC) efficiency, wideband operation and angular stability for oblique incidence up to 45°.
Highlights
Metasurfaces offer unprecedented opportunities to control and manipulate the amplitude, phase and polarization of electromagnetic waves
Efficient transparent 90◦ polarization rotator is achieved based on U-shaped periodic array using combined chirality and tunneling that operates over frequency range of 9.8-12.5 GHz [17]
Ultra-wideband (7.57-20.46 GHz) cross-polarization conversion (CPC) has been demonstrated through an anisotropic metasurface consisting of square-shaped resonators [19]
Summary
Metasurfaces offer unprecedented opportunities to control and manipulate the amplitude, phase and polarization of electromagnetic waves. The summary of the above literature review is that designing an angularly stable multifunctional metasurface with high polarization conversion efficiency and wide bandwidth on a single layer substrate is a challenging task. As it can be observed in the comparison table of metasurface, all previously published metasurfaces have employed either circular, square, rectangular or other arbitrary shapes. It has obvious advantages such as, higher packing efficiency, large electrical length in small area, lower operating frequency and in return, higher fractional bandwidth, and greater angular stability due to smaller periodicity. The two nearby resonances occurring at 11 GHz and 12.5 GHz help in extending the bandwidth of the second band (10.54-13.56 GHz)
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