Abstract
Metamaterials and metasurfaces have become important research topics in the electromagnetics community because of their wide scopes. A double metamaterial-based line antenna radiates a linearly polarized broadside beam across a wide frequency range, and an open metamaterial-based loop antenna radiates a dual-band counter circularly polarized wave. A metamaterial-based spiral antenna shows a different maximum gain in the frequency response of the left-handed and right-handed circularly polarized waves.
An efficient implicit finite-difference time-domain method formulated in cylindrical coordinates and based on a locally one-dimensional scheme is devised to analyze the performance of a metasurface-based terahertz frequency splitter. The frequency splitting behavior at 1.0 and 1.5 THz is demonstrated with a radially polarized wave as an incident wave. The computation time for the analysis is reduced to approximately one-half of that for the explicit FDTD method while maintaining comparable accuracy.
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Acknowledgment
We thank V. Shkawrytko for his assistance in the preparation of this manuscript.
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Nakano, H., Shibayama, J., Yamauchi, J. (2018). Metamaterial-Based Antennas and a Metasurface-Based Terahertz Frequency Splitter. In: Lakhtakia, A., Furse, C. (eds) The World of Applied Electromagnetics. Springer, Cham. https://doi.org/10.1007/978-3-319-58403-4_7
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DOI: https://doi.org/10.1007/978-3-319-58403-4_7
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