scholarly journals Broadband Dual-Polarized Single-Layer Reflectarray Antenna with Independently Controllable 1-Bit Dual Beams

2020 ◽  
Author(s):  
Jiexi Yin ◽  
Qun Lou ◽  
Haiming Wang ◽  
Zhining Chen ◽  
Wei Hong
Keyword(s):  
Phase Difference ◽  
Multiple Input Multiple Output ◽  
Single Layer ◽  
Unit Cell ◽  
Dual Beam ◽  
Polarized Waves ◽  
Unit Cells ◽  
Linearly Polarized ◽  
Reflectarray Antenna ◽  
Dual Polarized

<p>A broadband dual-polarized single-layer 1-bit unit cell is proposed for achieving the independently controllable dual-beam reflectarray antenna. The unit cell independently provides two-state phase compensation for two orthogonally linearly-polarized waves. The 180-degree reflective phase difference between the two states is achieved by tuning the magnetic resonance of State 0 and the electrical resonance of State 1. With its two resonances close to each other, the unit cell has a reflective phase difference of 180±20 degrees between two states over a broad bandwidth of 27.2-51.1 GHz. The cross-polarization levels of below -30 dB ensure the high isolation between two polarizations. Using the proposed dual-polarized unit cells, a 1-bit dual-beam reflectarray antenna is designed and excited by a dual-polarized horn to show the ability of independently controlling two orthogonally linearly-polarized waves. At 33 GHz, the beams direct to -15 degrees and 20 degrees for the feeding of horizontally and vertically polarized port, respectively. The 1.5-dB gain bandwidth is greater than 20% for both polarizations. The proposed dual-polarized reflectarray antenna with independently controllable 1-bit dual beams provides an alternative design for the multiuser multiple-input multiple-output applications.</p>

scholarly journals Broadband Dual-Polarized Single-Layer Reflectarray Antenna with Independently Controllable 1-Bit Dual Beams

2020 ◽  
Author(s):  
Jiexi Yin ◽  
Qun Lou ◽  
Haiming Wang ◽  
Zhining Chen ◽  
Wei Hong
Keyword(s):  
Phase Difference ◽  
Multiple Input Multiple Output ◽  
Single Layer ◽  
Unit Cell ◽  
Dual Beam ◽  
Polarized Waves ◽  
Unit Cells ◽  
Linearly Polarized ◽  
Reflectarray Antenna ◽  
Dual Polarized

<p>A broadband dual-polarized single-layer 1-bit unit cell is proposed for achieving the independently controllable dual-beam reflectarray antenna. The unit cell independently provides two-state phase compensation for two orthogonally linearly-polarized waves. The 180-degree reflective phase difference between the two states is achieved by tuning the magnetic resonance of State 0 and the electrical resonance of State 1. With its two resonances close to each other, the unit cell has a reflective phase difference of 180±20 degrees between two states over a broad bandwidth of 27.2-51.1 GHz. The cross-polarization levels of below -30 dB ensure the high isolation between two polarizations. Using the proposed dual-polarized unit cells, a 1-bit dual-beam reflectarray antenna is designed and excited by a dual-polarized horn to show the ability of independently controlling two orthogonally linearly-polarized waves. At 33 GHz, the beams direct to -15 degrees and 20 degrees for the feeding of horizontally and vertically polarized port, respectively. The 1.5-dB gain bandwidth is greater than 20% for both polarizations. The proposed dual-polarized reflectarray antenna with independently controllable 1-bit dual beams provides an alternative design for the multiuser multiple-input multiple-output applications.</p>

scholarly journals Ultrathin dual-mode vortex beam generator based on anisotropic coding metasurface

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Liang Zhang ◽  
Jie Guo ◽  
Tongyu Ding
Keyword(s):  
Communication Systems ◽  
Single Layer ◽  
Wireless Communication Systems ◽  
Vortex Beam ◽  
Proof Of Concept ◽  
Dual Mode ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Incident Waves

AbstractIn this paper, an anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is designed to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.

Linear to left- and right-hand circular polarization conversion by using a metasurface structure

2017 ◽  
Vol 10 (1) ◽  
pp. 133-138 ◽  
Author(s):  
Oguzhan Akgol ◽  
Olcay Altintas ◽  
Emin Unal ◽  
Muharrem Karaaslan ◽  
Faruk Karadag
Keyword(s):  
Axial Ratio ◽  
Wide Band ◽  
Polarization Conversion ◽  
Band Frequency ◽  
Left Handed ◽  
Linear Waves ◽  
Polarized Waves ◽  
Unit Cells ◽  
Linearly Polarized ◽  
Parallel Strips

By using a metasurface (MS) structure, a linearly polarized wave is converted to circularly polarized waves. Both right- and left-handed circular polarizations (RHCPs and LHCP) are obtained by a simple configuration in the proposed structure which consists of 16 unit cells arranged in a 4 × 4 layout. Each unit cell contains five horizontal and parallel strips embedded in a rectangular frame in which a single diagonal strip is placed from one corner to the opposed one. It is shown that the orientation of the diagonal line determines the handedness of the converted signal to be either LHCP or RHCP. In order to show the working conditions of the MS structure, scattering parameters are found for both co-polarized and cross-polarized responses. Axial ratio, an indicator for polarization conversion, is then obtained by dividing cross-polar response to co-polar response to demonstrate the transformation. The structure works for horizontally and vertically polarized linear waves in a wide band frequency range which is approximately 510 MHz. Since the suggested MS model is composed of a simple geometry for polarization conversion, it can be easily adjusted in any desired frequency bands for a variety of applications from the defence industry to medical, education, or communication areas.

scholarly journals An Ultrawideband Polarization-Insensitive Diffusion Metasurface Using Period Changed Unit Cell for RCS Reduction

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5053
Author(s):  
Jianzhong Chen ◽  
Chengwei Zhang ◽  
Yutong Zhao ◽  
Lei Lin ◽  
Liang Li ◽  
...  
Keyword(s):  
Cross Section ◽  
Phase Difference ◽  
Rotational Symmetry ◽  
Radar Cross Section ◽  
Unit Cell ◽  
Operating Frequency ◽  
Reflection Amplitude ◽  
Good Consistency ◽  
Unit Cells ◽  
Polarization Insensitive

A polarization-insensitive diffusion metasurface using a period-changed unit cell is presented for reducing the radar cross-section (RCS) of metallic objects in ultrawideband. Two metallic Minkowski loops are proposed as coding elements, different from traditional designs. The “0” element is constructed by period-changed unit cells to achieve a 180 ± 30° phase difference with the same reflection amplitude of nearly −0.9 dB in an ultrawideband from 7.1 to 29.2 GHz. Multilayer geometry with a thickness of 4.5 mm (about 0.105λ0 at the lowest operating frequency) and rotational symmetry loops are used to realize the ultrawideband characteristic and polarization-insensitive behavior. For verification, a polarization-insensitive diffusion metasurface is designed, fabricated, and measured. The simulated and measured results of the diffusion metasurface are in good consistency and the results both show that the metasurface enables a 10 dB backscattering reduction over an amazing ultrawideband ranging from 7.1 to 29.2 GHz (BW of 122%).

Ultrathin Dual-Mode Vortex Beam Generator Based on Anisotropic Coding Metasurface

2020 ◽  
Author(s):  
Liang Zhang ◽  
Jie Guo ◽  
Tongyu Ding
Keyword(s):  
Communication Systems ◽  
Single Layer ◽  
Wireless Communication Systems ◽  
Vortex Beam ◽  
Dual Mode ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Incident Waves ◽  
Is Design

Abstract In this paper, anisotropic coding metasurfaces is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is design to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.

scholarly journals Modular Pressure and Flow Rate-Balanced Microfluidic Serial Dilution Networks for Miniaturised Point-of-Care Diagnostic Platforms

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 911
Author(s):  
Nikolaos Vasilakis ◽  
Konstantinos Papadimitriou ◽  
Hywel Morgan ◽  
Themistoklis Prodromakis
Keyword(s):  
Network Architecture ◽  
Point Of Care ◽  
Single Layer ◽  
Unit Cell ◽  
Serial Dilution ◽  
Driving Mechanism ◽  
Buffer Solution ◽  
Unit Cells ◽  
And Performance ◽  
Diagnostic Applications

Fast, efficient and more importantly accurate serial dilution is a necessary requirement for most biochemical microfluidic-based quantitative diagnostic applications. Over the last two decades, a multitude of microfluidic devices has been proposed, each one demonstrating either a different type of dilution technique or complex system architecture based on various flow source and valving combinations. In this work, a novel serial dilution network architecture is demonstrated, implemented on two entirely different substrates for validation and performance characterisation. The single layer, stepwise serial diluter comprises an optimised microfluidic network, where identical dilution ratios per stage are ensured, either by applying equal pressure or equal flow rates at both inlets. The advantages of this serial diluter are twofold: Firstly, it is structured as a modular unit cell, simplifying the required fluid driving mechanism to a single source for both sample and buffer solution. Thus, this unit cell can be used as a fundamental microfluidic building block, forming multistage serial dilution cascades, once combined appropriately with itself or other similar unit cells. Secondly, the serial diluter can tolerate the inevitable flow source fluctuations, ensuring constant dilution ratios without the need to employ damping mechanisms, making it ideal for Point of Care (PoC) platforms. Proof-of-concept experiments with glucose have demonstrated good agreement between simulations and measurements, highlighting the validity of our serial diluter.

Unusual Properties of Anisotropic Magnetodielectric Metamaterials

2014 ◽  
Vol 1082 ◽  
pp. 46-50
Author(s):  
Yun Xia Dong ◽  
Chun Ying Liu
Keyword(s):  
Electromagnetic Field ◽  
Green Function ◽  
Layer Structure ◽  
Single Layer ◽  
Input Output ◽  
Anisotropic Metamaterials ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
The Green Function ◽  
Green Function Approach

A phenomenological quantization of electromagnetic field is introduced in the presence of the anisotropic magnetodielectric metamaterials. For a single layer structure with the anisotropic metamaterials, input-output relations are derived using the Green-function approach. Based on these relations, the reflectance of the linearly polarized wave through this structure is calculated. The results show different reflectance for different polarized waves and indicate an application of the anisotropic metamaterials to be the reflectors for certain polarized wave. Furthermore it is found that such a structure can realize the resonant gap with the increase of the thickness. Finally the effects of the absorption are considered and we find that the above properties do not change with introduction of the absorption.

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