A Shared Aperture 1 Bit Metasurface for Orbital Angular Momentum Multiplexing

Zhang, Di; Cao, Xiangyu; Gao, Jun; Yang, Huanhuan; Li, Wenqiang; Li, Tong; Tian, Jiahong

doi:10.1109/lawp.2019.2893492

Cited by 22 publications

(10 citation statements)

References 18 publications

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“…, respectively. The secrecy capacity Cs is calculated as [19] s m w C C C (12) According to [23], the probabilistic metric for characterizing the security for the radio communications, which is also known as a probability of positive secrecy capacity, is defined as ss Pr( 0) PC ( 13)…”

Section: Secrecy Capacitymentioning

confidence: 99%

“…Meta-surface is an artificial periodic structure consisting of the units smaller than the carrier wavelength and generates OAM beams by controlling the shape and distribution of the units to adjust the beam phase. Due to the high cost and complicated structure, many researches on meta-surfaces usually focus on the optimization and improvement of the meta-surface itself [11], [12]. UCA, a typical method for generating OAM beams, can generate OAM beams with multiple modes flexibly and the relative theory is relatively mature [13], [14].…”

Section: Introductionmentioning

confidence: 99%

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Capacity and Security Analysis of Multi-Mode Orbital Angular Momentum Communications

et al. 2020

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Physical layer security is a cross research hotspot of information security and wireless communications. Recently, orbital angular momentum (OAM) technology has attracted widespread attention due to its potential of improving capacity and spectrum efficiency. However, there are few researches on system security based on OAM technology. In this work, we studied the security of the proposed OAM wiretap system by applying physical layer security theory to OAM communications. Firstly, we proposed a uniform circular array-based multi-mode OAM system and derived the secrecy capacity. Secondly, the phase profiles, channel capacity and received power of OAM beams are analyzed in terms of various system parameters in oblique scenarios at 30GHz. Thirdly, we discussed the security of the proposed OAM wiretap system. The results show that the system using vortex waves is superior to conventional communication systems using planar electromagnetic waves in terms of system security due to the inherent divergence and spiral phase structure of OAM beams. Moreover, we found that the distortion of OAM beams during transmission and the center shift at receiving end will occur and that system is more stable for high-mode OAM propagation in oblique scenarios. This work can provide an effective guidance for the research and application of OAM communications.

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Section: Secrecy Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacity and Security Analysis of Multi-Mode Orbital Angular Momentum Communications

et al. 2020

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“…More importantly, the OAM vortex waves with different l are orthogonal to each other so that they can carry information at the same frequency but without interference. [5][6][7] Hence, the OAM vortex wave is expected to improve the communication capacity. Besides wireless communication, the OAM vortex wave can also be applied to military use such as radar imaging.…”

Section: Introductionmentioning

confidence: 99%

An orbital angular momentum vortex wave antenna with low in‐band radar cross section and reduced divergence angle

Xin-hong

2022

Int J RF Mic Comp-Aid Eng

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In this article, an orbital angular momentum (OAM) vortex wave antenna with low radar cross section (RCS) and reduced divergence angle is proposed. The antenna is composed of four slot-coupled elements working from 7.5 to 8.0 GHz and fed by a phase shift network. OAM vortex wave with l = 1 is generated. In order to reduce the RCS and divergence angle simultaneously, complementary split-ring resonators (CSRRs) are designed and integrated to the antenna. The CSRRs can stop the transmission of surface wave and reflect the incident energy with phase canceling scheme. As a result, the RCS and divergence angle is reduced simultaneously.

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“…Besides the aforementioned OAM generation researches, some efforts have been applied to achieve metasurface-enabled OAM multiplexing, such as using metasurface array, [19] shared aperture metasurface, [20] cross-polarized incident waves, [21][22][23][24][25] and multi-wavelength incidence waves. [26] The metasurface array increases the complexity and cost of the communication system and results in extra losses.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Angle‐Multiplexed Metasurface for Multi‐Dimensional Multiplexing of Spatial and Frequency Domains

Wang

Yang

Deng

et al. 2020

Advcd Theory and Sims

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Increasing information capacity is crucial for high-capacity and high-speed communication, especially for sub-terahertz communication. Over the last decade, spatial multiplexing based on the orbital angular momentum (OAM) by adopting a multi-mode OAM metasurface has attracted a lot of attention. However, current metasurface-based OAM multiplexing methods suffer from complex and limited multiplexing channels. In this paper, a novel method to realize multi-dimensional multiplexing combining OAM and frequency based on an angle-multiplexed metasurface over a broadband terahertz region is proposed and investigated. A frequency-independent phase profile formula of the angle-multiplexed metasurface is derived. A reflective metasurface operating from 0.25 to 0.35 terahertz (THz) is designed based on this formula. For proof of concept, nine-channel multiplexing is illustrated based on this novel method. The simulation results verify that nine-channel off-axis left-hand circularly polarized beams are converted to nine orthogonal coaxial beams. Besides, according to the conventional method for OAM multiplexing, an angle-multiplexed reflective metasurface working at 0.3 THz is designed for comparison. The simulation results show that only three-channel multiplexing can be obtained by this model with nine-channel incident waves. The proposed method has a great potential to enhance the transmission capacity of the communication system.

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A Shared Aperture 1 Bit Metasurface for Orbital Angular Momentum Multiplexing

Cited by 22 publications

References 18 publications

Capacity and Security Analysis of Multi-Mode Orbital Angular Momentum Communications

Capacity and Security Analysis of Multi-Mode Orbital Angular Momentum Communications

An orbital angular momentum vortex wave antenna with low in‐band radar cross section and reduced divergence angle

Terahertz Angle‐Multiplexed Metasurface for Multi‐Dimensional Multiplexing of Spatial and Frequency Domains

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