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Dual-Wide-Band Dual Polarization Terahertz Linear to Circular Polarization Converters based on Bi-Layered Transmissive Metasurfaces

1
School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
2
Beijing Key Laboratory for Microwave Sensing and Security Applications, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(8), 869; https://doi.org/10.3390/electronics8080869
Received: 7 June 2019 / Revised: 21 July 2019 / Accepted: 4 August 2019 / Published: 6 August 2019
(This article belongs to the Special Issue Engineering Metamaterials)
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Abstract

Transmissive metasurface-based dual-wide-band dual circular polarized operation is needed to facilitate volume and size reduction along with polarization diversity for future THz wireless communication. In this paper, a novel dual-wide-band THz linear polarization to circular polarization (LP-to-CP) converter is proposed using transmissive metasurfaces. It converts incident X polarized waves into transmitted left-hand circular polarized (LHCP) and right-hand circular polarized (RHCP) waves at two frequency bands. The structure consists of bi-layered metasurfaces having an outer conductor square ring and three inner conductor squares diagonally intersecting each other. The proposed converter works equally well with incident Y polarizations. Operational bandwidths for the dual-band LP-to-CP are 1.16 THz to 1.634 THz (34% fractional bandwidth) and 3.935 THz to 5.29 THz (29% fractional bandwidth). The electromagnetic simulation was carried out in two industry-standard software packages, High Frequency Structure Simulator (HFSS) and Computer Simulation Technology (CST), using frequency and time domain solvers respectively. Close agreement between results depicts the validity and reliability of the proposed design. The idea is supported by equivalent circuits and physical mechanisms involved in the dual-wide-band dual polarization operation. The impact of different geometrical parameters of the unit cell on the performance of LP-to-CP operation is also investigated. View Full-Text
Keywords: metasurfaces; linear to circular polarization converter; dual-band polarization converters; transmission-based polarization conversion metasurfaces; linear to circular polarization converter; dual-band polarization converters; transmission-based polarization conversion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fahad, A.K.; Ruan, C.; Chen, K. Dual-Wide-Band Dual Polarization Terahertz Linear to Circular Polarization Converters based on Bi-Layered Transmissive Metasurfaces. Electronics 2019, 8, 869.

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