Abstract
We present a metasurface consisting of W-shaped resonators to realize broadband reflective linear and circular polarization conversions. We find that the cross polarization conversion ratio for normal incidence is over 0.95 from 9.2 to 18.7 GHz, covering 68.1% of the central frequency. We also show that, the conversion performance is almost insensitive to the angle of incident waves. Furthermore, by simply adjusting the geometrical parameters of the W-shaped metasurface, the broadband circular polarization conversion is also achieved. We emphasize that the bandwidth of axis ratio less than 3.0 dB covers from 10.1 to 17.7 GHz, equivalent to 54.7% relative bandwidth. Due to these broadband and high-efficiency polarization conversion features, our proposal may have a wide application prospect.
Highlights
Polarization is an important property of electromagnetic (EM) waves
The results show that the cross polarization conversion ratio (PCR) for normal incidence is over 0.95 from 9.2 to 18.7 GHz, covering 68.1% of the central frequency
The conversion performance is almost insensitive to the angle of incident waves
Summary
Polarization is an important property of electromagnetic (EM) waves. The manipulate of polarization state of EM waves is critical in practical applications, such as quarter and half-wave plates, anomalous reflection, holograms, and so on (Yu et al, 2011; Larouche et al, 2012; Yu et al, 2012; Pfeiffer and Grbic, 2013; Xu et al, 2013; He et al, 2014; Jiang et al, 2014). Some high-efficiency linear to linear and linear to circular polarization converters have been demonstrated in microwave, terahertz, and optical frequency bands A metasurface based on metal-dielectric-metal configuration is proposed to realize broadband reflective linear and circular polarization conversions. The results reveal that the axis ratio (AR) is less than 3.0 dB in the range of 10.1–17.7 GHz, equivalent to 54.7% relative bandwidth Owing to these broadband and highefficiency features, our proposal may facilitate further researches on matematerials-enabled polarization manipulation. By controlling the amplitude and phase of the two orthogonal components of the reflected wave, the broadband polarization manipulation can be realized. We take the CST Microwave Studio for all numerical simulations
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