Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By Y. Cheng, W. Li, and X. Mao

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We propose a planar chiral metamaterial (PCMM), which can function as a triple-band polarization angle independent 90° polarization rotator. The unit cell of the PCMM is composed of bi-layered mutual twisted Fermat's spiral structure (FSS) resonators with four-fold rotation symmetry. The simulated and measured results show that the PCMM can work in triple-band and convert a linearly polarized (y-/x-polarized) wave to its cross-polarization (x-/y-polarized) or experience a near 90° polarization rotation with a polarization conversion ratio of over 90%. The electric field and surface current distributions of the unit-cell structure are analyzed to study its physics mechanism. Compared with previous CMM-based rotator, our design has more operation frequencies in a single PCMM structure, a relative thinner thickness, and higher Q-factor. Good performances of the PCMM suggest promising applications in the polarization rotator or convertor that need to be integrated with other compact devices.

Y. Cheng, W. Li, and X. Mao, "Triple-Band Polarization Angle Independent 90° Polarization Rotator Based on Fermat's Spiral Structure Planar Chiral Metamaterial," Progress In Electromagnetics Research, Vol. 165, 35-45, 2019.

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