scholarly journals Generating Tunable Orbital Angular Momentum Radio Beams With Dual-Circular-Polarization and Dual-Mode Characteristics

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 211248-211254
Author(s):  
Hui Li ◽  
Le Kang ◽  
Ke Dong
Keyword(s):  
Angular Momentum ◽  
Circular Polarization ◽  
Orbital Angular Momentum ◽  
Dual Mode ◽  
Mode Characteristics

Transmissive 2-bit anisotropic coding metasurface

2022 ◽  
Author(s):  
Pengtao Lai ◽  
Zenglin Li ◽  
Wei Wang ◽  
Jia Qu ◽  
Liang Wei Wu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Electromagnetic Wave ◽  
Circular Polarization ◽  
Orbital Angular Momentum ◽  
Electromagnetic Waves ◽  
Beam Splitter ◽  
Far Field ◽  
Polarization Conversion ◽  
Field Patterns ◽  
Phase Profile

Abstract Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic wave. However, archiving transmissive coding metasurface is still challenging. Here we propose a transmissive anisotropic coding metasurface that enables the independent control of two orthogonal polarizations. The polarization beam splitter and the OAM generator have been studied as typical applications of anisotropic 2-bit coding metasurface. The simulated far field patterns illustrate that the x and y polarized electromagnetic waves are deflected into two different directions, respectively. The anisotropic coding metasurface has been experimentally verified to realize an orbital angular momentum (OAM) beam with l = 2 of right-handed polarized wave, resulting from both contributions from linear-to-circular polarization conversion and the phase profile modulation. This work is beneficial to enrich the polarization manipulation field and develop transmissive coding metasurfaces.

scholarly journals Generation of Orbital Angular Momentum Beam With Circular Polarization Ceramic Antenna Array

2019 ◽  
Vol 11 (2) ◽  
pp. 1-8 ◽  
Author(s):  
Ke Bi ◽  
Jianchun Xu ◽  
Daquan Yang ◽  
Yanan Hao ◽  
Xinlu Gao ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Circular Polarization ◽  
Antenna Array ◽  
Orbital Angular Momentum

A dual-mode orbital angular momentum antenna array

2016 ◽  
Author(s):  
Yu Yao ◽  
Xianling Liang ◽  
Xudong Bai ◽  
Zheng Peng ◽  
Yang Qian ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Antenna Array ◽  
Orbital Angular Momentum ◽  
Dual Mode

scholarly journals An Inner- and Outer-Fed Dual-Arm Archimedean Spiral Antenna for Generating Multiple Orbital Angular Momentum Modes

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 251 ◽  
Author(s):  
Lulu Wang ◽  
Huiyong Chen ◽  
Kai Guo ◽  
Fei Shen ◽  
Zhongyi Guo
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Topological Charge ◽  
Communication Systems ◽  
Spiral Antenna ◽  
Dual Mode ◽  
Archimedean Spiral ◽  
Conical Cavity ◽  
Measurement Results ◽  
Dual Arm

Orbital angular momentum (OAM) beams have attracted great attention owing to their excellent performances in imaging and communication. In this paper, a dual-arm Archimedean spiral antenna (DASA) is proposed to generate multiple OAM states with positive and negative values by feeding at the inner and outer ends, respectively. The topological charge of radiated vortex waves is reconfigurable by tuning the operating frequency. Dual-mode OAM states are generated at different working frequencies (l = ±1 at 3 GHz, l = ±2 at 4 GHz, and l = ±3 at 4.8 GHz). Both the simulation and measurement results demonstrate that OAM beams can be generated effectively by the DASA. In addition, a conical cavity is used to increase the gain of the proposed DASA for more than 5 dBi in comparison to the traditional cylindrical cavity. Furthermore, the qualities of the generated OAM modes by the proposed DASA have been evaluated at different operating frequencies of 3 GHz, 4 GHz, and 4.8 GHz, respectively. The OAM modes purities of l = −1, −2, −3, 1, 2, and 3 are predominate with the proportion of about 81%, 70%, 74%, 78%, 77%, and 75%, respectively. Our results demonstrate that the proposed DASA has great potentials in OAM multiplexing communication systems.

scholarly journals Phase Singularities to Polarization Singularities

2020 ◽  
Vol 2020 ◽  
pp. 1-33
Author(s):  
Ruchi ◽  
P. Senthilkumaran ◽  
Sushanta Kumar Pal
Keyword(s):  
Angular Momentum ◽  
Circular Polarization ◽  
Orbital Angular Momentum ◽  
Polarization Vector ◽  
Scalar Fields ◽  
Phase Gradient ◽  
Phase Singularities ◽  
Light Beams

Polarization singularities are superpositions of orbital angular momentum (OAM) states in orthogonal circular polarization basis. The intrinsic OAM of light beams arises due to the helical wavefronts of phase singularities. In phase singularities, circulating phase gradients and, in polarization singularities, circulating ϕ12 Stokes phase gradients are present. At the phase and polarization singularities, undefined quantities are the phase and ϕ12 Stokes phase, respectively. Conversion of circulating phase gradient into circulating Stokes phase gradient reveals the connection between phase (scalar) and polarization (vector) singularities. We demonstrate this by theoretically and experimentally generating polarization singularities using phase singularities. Furthermore, the relation between scalar fields and Stokes fields and the singularities in each of them is discussed. This paper is written as a tutorial-cum-review-type article keeping in mind the beginners and researchers in other areas, yet many of the concepts are given novel explanations by adopting different approaches from the available literature on this subject.

Mode Measurement of a Dual-Mode Radio Frequency Orbital Angular Momentum Beam by Circular Phase Gradient Method

2017 ◽  
Vol 16 ◽  
pp. 1143-1146 ◽  
Author(s):  
Mutong Xie ◽  
Xinlu Gao ◽  
Mingyang Zhao ◽  
Wensheng Zhai ◽  
Wenjing Xu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Radio Frequency ◽  
Orbital Angular Momentum ◽  
Gradient Method ◽  
Dual Mode ◽  
Phase Gradient
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