Recent progress on RF orbital angular momentum antennas

Abstract

In the last five years or so, there has been a great interest in RF OAM to address the contradiction between the lack of wireless spectrum resources and the continually growing demands of the bandwidth. Recent developments and technological advancements in antenna design, material science, and integrated circuits have enabled miniaturized, multiple modes, tunable in radio frequency (RF) orbital angular momentum (OAM) antenna designs. From conventional methods such as spiral phase plate and reflector antenna to antenna array and metasurface, the working principle and structures are introduced. To improve the performance of RF OAM antennas, several innovative physical concepts, including multiple-input multiple-output, circular polarization rotation, PIN diodes dynamic regulation, and so on have been explored for the designs of RF OAM antenna designs. In this paper, we present an up-to-date survey on the development of RF OAM antenna technologies. We provide details on structure designs and theoretical analyses. The evaluate method and advantage analyses are also included. Open issues and development trends are explored as a source of inspiration towards the future better outcome of RF OAM antenna designs.

A Review of Orbital Angular Momentum Vortex Waves for the Next Generation Wireless Communications

“…In this method, there is a feeder to generate incident wave which is plane EM wave and there are parabolic reflector plates to reflect the incident wave. The method works on the same principle as the SPP, where the propagated wave's phase variation depends on the azimuthal angle [19]. However, the main difference between the two methods is that, in the SPP, the introduction of the phase factor exp 𝑖𝑙𝜙 happens during the transmission process.…”

“…Meanwhile, in [18], the authors provide literature on the advantages of OAM waves and carried out a brief case study to compare OAM with FDMA scheme. [19] provides a comprehensive review of different methods to generate OAM waves only. Moreover, in [20], the authors did not cover OAM waves generation using dielectric resonator antenna (DRA), multiuser-OAM communication, OAM waves phase distribution measurement and factors that influence OAM mode purity.…”

The design of a multi‐band bionic antenna for mobile terminals

“…14,15 Meanwhile, owing to the lack of wireless spectrum resources, the demand for multi-band antenna has increased. [16][17][18][19][20] Many methods have been studied to obtain multi-band antenna, such as coupling feed technologies, 21 slot-loaded technologies, 22 and reconfigurable technologies. 23,24 Unfortunately, these methods require complex calculation, and the antenna structures are difficult to manufacture.…”

Generation of Plane Spiral Orbital Angular Momentum Waves by Microstrip Yagi Antenna Array

“…As communication technology evolves rapidly, the contradiction between finite electromagnetic spectrum resources and continuously increasing bandwidth requirements has become increasingly prominent [1], [2]. As an inherent attribute of electromagnetic waves, orbital angular momentum (OAM) is expected to be a new degree of freedom that can be used to modulate and multiplex electromagnetic waves after amplitude, phase, frequency, and polarization [3], [4].…”