Quasi-Crystal Metasurface for Simultaneous Half- and Quarter-Wave Plate Operation

• Published in: Scientific reports Vol. 8; no. 1; pp. 15743 - 10
• Main Authors: Mustafa, Meraj-E-, Amin, Muhammad, Siddiqui, Omar, Tahir, Farooq A.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 24.10.2018; Nature Publishing Group
• Subjects: 639/166/987; 639/766/25; Anisotropy; Crystals; Efficiency; Electric fields; Humanities and Social Sciences; multidisciplinary; Polarization; Propagation; Remote sensing; Satellite communications; Science; Science (multidisciplinary); Incident Wave Polarization; Metasurface; Cross-polarized Component; Anisotropic Patch; Left-hand Circular Polarization (LHCP)
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-018-34142-y

We present a quasi-crystal metasurface that can simultaneously work as efficient cross-polarizer and circular polarizer for wide range of frequencies. The quasi-crystal technique benefits from individual resonant response of anisotropic patch and the coupled response due to periodic perturbations in the square lattice. It is shown that quasi-crystals offer broadband response for cross-polarization as well as high efficiency circular-polarization conversion of reflected fields. The quasi-crystal metasurface achieves cross-polarization (above −3 dB) for two broad frequency bands between 10.28–15.50 GHz and 16.21–18.80 GHz. Furthermore, the proposed metasurface can simultaneously work as high efficiency circular-polarizer from 10.15–10.27 GHz and 15.51–16.20 GHz. The metasurface design is also optimized to suppress co-polarization below −10 dB between 10.5–15.5 GHz. This metasurface can find potential applications in reflector antennas, imaging microscopy, remote sensing, and control of radar cross-section etc.