Hybrid Polarization-Phase Tuning Methodology for Reflectarray Antennas

Zhang, Xingliang; Yang, Fan; Xu, Shenheng; Aziz, Abdul; Li, Maokun

doi:10.1109/tap.2021.3060023

Cited by 17 publications

(7 citation statements)

References 41 publications

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“…The latter achieves phase control by rotating the meta-atom structure [ 32 , 33 ], but only for circularly polarized waves. A hybrid phase-tuning method has been used to achieve high-gain and broadband pencil beams by synthesizing the above two approaches [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface

Zhao

et al. 2023

Micromachines

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Vortex beams carrying orbital angular momentum (OAM) have become a research frontier due to the prospect of improving spectral efficiency and transmission capacity in communication systems. In this work, a hybrid phase-turning meta-atom that combines resonance and geometric (Pancharatnam-Berry) phase modulation is used to form a single-layer metasurface. A linearly polarized broadband vortex beam of mode l = −1 is obtained by the metasurface. An experimental prototype of the vortex beam generator has been fabricated and measured. The simulated and measured results demonstrate that the whole vortex beam generator exhibits over 70% mode purity from 26.5 GHz to 40 GHz (the relative bandwidth is 38.57%). In addition, a wide 3 dB gain bandwidth and low crosstalk are also provided by the proposed generator. This indicates that the proposed generator has important application value for vortex beam communication and its related applications.

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Section: Introductionmentioning

confidence: 99%

A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface

Zhao

et al. 2023

Micromachines

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“…18 and Ref. 19 ) improves the reflecting metasurface bandwidth up to 20% by only the use of single-layered configurations. In this regard, several works are reported to design of wideband or multi-band polarization conversion metasurfaces [20][21][22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, several works are reported to design of wideband or multi-band polarization conversion metasurfaces [20][21][22][23][24] . It can be understood that there is more freedom to manipulate the phase of reflected waves in cross-polarization mode compared with the co-polarization (copol) one in reflective structures 17,19,25 . For example, the authors in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, sidelobe level enhancement is inevitable in 1-bit phase quantization apertures specifically in the off-centered feed configuration. To circumvent this drawback, a polarization conversion unit cell with the capability of generating continuous phase shifting over the reflected wave was introduced in which the 1-dB gain bandwidth up to 18.5% was reported using this technique 19 .…”

Section: Introductionmentioning

confidence: 99%

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High-Efficiency Dual-Polarized Broadband Reflecting Metasurface Using Continuous Polarization Conversion Technique and Element with Multi Degree of Freedom

Karimipour

Aryanian

2022

Preprint

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In this study, two effective approaches are combined which are implemented at the element design level and system design level to simultaneously improve the frequency bandwidth and aperture efficiency of a dual-polarized single-layer reflecting metasurface. At the element design level, a broadband behavior is realized by using the polarization conversion technique (PCT) which is a novel technique to enhance the bandwidth of the element. To this end, an anisotropic metasurface with I-shaped metal patch is proposed for rotating the polarization of the wave emitted from a point source by 90 • and making a continuous phase shift in a full range of 360 • within 8-18 GHz.Therefore, a completely equiphase aperture is achieved leading to enhancing the metasurface performance such as directivity and aperture efficiency and reducing the sidelobe level compared to reflecting metasurface developed by 1-bit phase quantization technique. At the system design level, the three-frequency phase synthesis (TFPS) method, which is based on determining the best constant reference phase for the aperture, is used and the corresponding constant reference phases are optimized to minimize the phase error in the whole band. The combination of TFPS and PCT enhances the effectiveness of the TFPS method considerably. An 841 element reflecting metasurface with aperture dimensions of 290 cm × 290 cm is designed, simulated, and fabricated in Ku-band to verify the concept. The measurement results show that the 1-dB gain bandwidth before and after combining PCT and TFPS techniques are 17.47% (14.1 GHz to 16.8 GHz) and 30.3% (14 GHz to 19 GHz), respectively. In addition, the maximum aperture efficiency of the proposed metasurface is 63.62% which occurs at 14.5 GHz.

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“…The second method utilizes the combination of Berry-phase (BP) and DP delays with a single functional layer. By rotating anisotropic elements, dual-CP RAs with independent dual-CP beam control can be achieved [7]- [11]. Such hybrid polarization-phase tuning methodology was presented for RA antenna designs in [8], which can generate adjacent pencil beams for two orthogonal CPs at 20 GHz with a 1.5 dB gain variation over a bandwidth of 7.6% and a peak antenna efficiency of 66%.…”

Section: Introductionmentioning

confidence: 99%

Wideband Dual-Circularly-Polarized Reflect-Arrays Based on Dual-Functional-Layer Cells With Berry-Phase Compensation at X-Band

Jiang

Tong

et al. 2022

IEEE Trans. Antennas Propagat.

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We present the design and experimental validation of wideband dual-circularly-polarized (dual-CP) reflect-arrays (RAs) based on dualfunctional-layered unit cells with independent control of circular polarizations. The proposed dual-CP RA cells comprise a circular polarization selective surface (CPSS) on the top based on a bandwidthenhanced dual-meandered Pierrot structure that implements polarization selection of CP waves and a reflective half-wave plate (HWP) on the bottom. The dual-CP phase delay of the RA cells relies on the Berry-phase dictated by the rotation of the CPSS and HWP elements for achieving reflective beamforming of CP waves of opposite handedness. The diffractive properties of an infinite periodic gradient array of the dual-CP RA cells in a triangular lattice are investigated, which numerically verifies the dual-CP anomalous reflection capability. Two proof-of-concepts operating at X-band are designed, fabricated, and characterized. By replacing only the bottom functional layer of the RA, symmetrical and asymmetrically-distributed dual-CP beams can be obtained. A measured peak gain of higher than 23.5 dBic is achieved, with a joint bandwidth of 11% for an axial ratio < 2 dB and a gain variation < 1 dB. The improved bandwidth performance, highresolution BP compensation, and printed manufacturing process without using any metallic cavities make the demonstrated CPSS-based dual-CP RAs promising candidates for wireless observation and satellite communications.

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Hybrid Polarization-Phase Tuning Methodology for Reflectarray Antennas

Cited by 17 publications

References 41 publications

A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface

A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface

High-Efficiency Dual-Polarized Broadband Reflecting Metasurface Using Continuous Polarization Conversion Technique and Element with Multi Degree of Freedom

Wideband Dual-Circularly-Polarized Reflect-Arrays Based on Dual-Functional-Layer Cells With Berry-Phase Compensation at X-Band

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