scholarly journals Performance Analyses of the Radio Orbital Angular Momentum Steering Technique Based on Ka-Band Antenna

2017 ◽  
Vol 2017 ◽  
pp. 1-12
Author(s):  
Mingtuan Lin ◽  
Yue Gao ◽  
Peiguo Liu ◽  
Zhiqing Guo
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Circular Array ◽  
Radiation Patterns ◽  
Transmission Performance ◽  
Ka Band ◽  
Performance Analyses

The misalignment in the orbital angular momentum- (OAM-) based system would distort the radiation patterns of twisted beams carrying OAM, consequently making the OAM-based communication infeasible. To tackle the misalignment problem, a radio OAM steering technique based on a uniform circular array (UCA) is illustrated. Subsequently, simulations are conducted to explore the influence of the OAM steering on the OAM mode quality and transmission performance. Furthermore, UCAs working at Ka-band with formulated feeding networks are designed and fabricated to analyze the performance of the OAM steering. The influences of OAM steering on mode quality and orthogonality are then evaluated in the experiment. Overall, the analyses of OAM steering technique are beneficial for the development of radio OAM study.

scholarly journals Frequency-Diverse Bunching Metamaterial Antenna for Coincidence Imaging

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1817 ◽  
Author(s):  
Mengran Zhao ◽  
Shitao Zhu ◽  
Jianxing Li ◽  
Hongyu Shi ◽  
Juan Chen ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Random Distribution ◽  
Correlation Coefficients ◽  
Radiation Efficiency ◽  
Circular Array ◽  
Radiation Patterns ◽  
Ka Band ◽  
Metamaterial Antenna ◽  
Imaging Experiment ◽  
Coincidence Imaging

A frequency-diverse bunching metamaterial antenna for coincidence imaging in the Ka band is proposed in this paper. The bunching metamaterial antenna includes a broadband circular array and a frequency-diverse bunching metalens. Firstly, in order to enhance the bunching characteristic, the broadband circular array is designed based on the 60-degree beamwidth design to generate radiation patterns from 32 GHz to 36 GHz. Then, types of metamaterial elements with different transmission phases are selected to form the frequency-diverse bunching metalens based on a random distribution design and gradient zoom coefficient design. Moreover, the bunching metamaterial antenna is constituted by loading the frequency-diverse bunching metalens to the broadband circular array, which can generate frequency-diverse bunching random radiation patterns with beamwidth less than 100 degrees from 32 GHz to 36 GHz. Furthermore, the performances of the bunching metamaterial antenna, including the reflection coefficient, the radiation efficiency, and the correlation coefficients of radiation patterns at different frequencies are evaluated. Finally, the coincidence imaging experiment is implemented using the bunching metamaterial antenna and the image of the target is reconstructed successfully. The design is verified by simulations and measurements.

Beam axis detection and alignment for uniform circular array-based orbital angular momentum wireless communication

2016 ◽  
Vol 10 (1) ◽  
pp. 44-49 ◽  
Author(s):  
Hui Tian ◽  
Huiling Jiang ◽  
Ziqiang Liu ◽  
Liu Liu ◽  
Gaofeng Nie ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Wireless Communication ◽  
Orbital Angular Momentum ◽  
Beam Axis ◽  
Circular Array

scholarly journals Three-Mode Vortex Wave Generator with Double-Layer Patch Antennas

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Jun Hu ◽  
Tong-Tong Qiu ◽  
Xue Lan ◽  
Wei Xu ◽  
Song-Song Qian
Keyword(s):  
Angular Momentum ◽  
Double Layer ◽  
Orbital Angular Momentum ◽  
Multiple Input Multiple Output ◽  
Patch Antennas ◽  
Circular Array ◽  
Planar Antennas ◽  
Multiple Input ◽  
Wave Generator ◽  
Input Multiple Output

With the development of Multiple-Input Multiple-Output technologies, researches on radio vortex wave with orbital angular momentum have become active. At the same time, generators of miniaturized planar antennas have become very interesting. Considering multilayer package, we proposed a uniform circle array consisting of four double-layer patch antennas with microstrip backfeeds. The antenna can generate three modes of vortex waves, which works at frequency 7.6GHz with a bandwidth 8.5%. Compared with orbital angular momentum antennas of phased uniform circular array with other cells, this proposed structure can be easily integrated with planar feeding networks and decoupling networks.

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