Ultra-wideband Linear-to-Circular Polarization Conversion Realized by an 8-shaped Metasurface
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Ultra‑wideband Linear‑to‑Circular Polarization Conversion Realized by an 8‑shaped Metasurface Bao‑qin Lin1 · Wen‑zhun Huang1 · Lin‑tao Lv1 · Jian‑xin Guo1 · Shi‑qi Huang1 · Rui Zhu1 Received: 23 August 2020 / Accepted: 3 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, one 8-shaped metasurface (MS) is proposed, which consists of a square array of 8-shaped conducting patches printed on a grounded dielectric substrate and covered by a top dielectric layer. Because the MS is symmetric with respect to both the x- and y-axes, and the phase difference between the reflection coefficients rxx and ryy is close to + 90° in an ultra-wide frequency band, it can be used as an ultra-wideband linear-to-circular polarization converter. Simulation results show that the MS can realize high-efficiency and ultra-wideband linear-to-circular polarization conversion under both u- and v-polarized incidences; the axial ratio (AR) of the reflected wave is below 3 dB in the ultra-wide frequency band of 6.45–24.20 GHz, which is corresponding to a relative bandwidth of 116%; in addition, the polarization conversion rate (PCR) can be maintained larger than 99.5% in the frequency range of 6.78–23.70 GHz, which occupies 95.3% of the 3 dB-axial-ratio-band. Finally, an experimental verification is carried out, a good agreement between the experimental and simulation results is observed. Keywords Polarization Converter · Metasurface (MS) · Circular Polarization
Introduction Metasurfaces (MS) are the planar version of metamaterials, which can be used to control the phase [1-6], amplitude [5, 6], and polarization [7–26] of EM wave or light in sub-wavelength scale. In the past decade, to update the conventional design method of polarization converter, many different types of polarization converters have been proposed based on various MSs. However, the existing references indicate that although there are many ultra-wideband linear polarization converters proposed [7–14], the proposed ultrawideband linear-to-circular (LTC) polarization converters are still few. The relative bandwidths of the LTC polarization converters proposed in previous studies [15–22] were all less than 60%. The two ultra-wideband LTC polarization converter proposed in previous studies [24, 25] has received tremendous attention, but their relative bandwidths were only 80% and 83.91%, respectively. In Reference [26], Mahdi reported a LTC polarization converter in terahertz regime, the 3 dB-axial-ratio-bandwidth has been widened * Bao‑qin Lin [email protected] 1
School of Information Engineering, Xijing University, Xi’an 710123, China
to 116%; however, the polarization converter was based on a three-layer rectangular-patch MS, moreover, its polarization conversion rate (PCR) was not very high. In this work, one 8-shaped MS is proposed. Both simulation and experimental results show that the 8-shaped MS can be used as a LTC polarization converter and realize highefficiency and ultra-wideband LTC polarization conversion under b
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