Radial Uniform Circular Antenna Array for Dual-Mode OAM Communication

Guo, Zhi-Gui; Yang, Guo‐Min

doi:10.1109/lawp.2016.2581204

Cited by 115 publications

(43 citation statements)

References 12 publications

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“…Unlike a typical OAM antenna with a null at the boresight direction, the proposed antenna has a maximum gain at the boresight direction when l = ±1. This is a unique characteristic of a radial UCA, which has been previously reported in the literature [14,17]. Fig.…”

Section: Resultssupporting

confidence: 69%

“…In [16], two UCAs of different radius were placed concentrically on the same plane, and two OAM modes (l = +1, +2) were generated simultaneously. In [17], two radial UCAs with the same radius were alternately arranged in the same plane and generated a pair of complementary OAM modes (l = ±1) simultaneously. In the above UCA antennas, each UCA was connected to an individual feeding network, generating only one OAM mode.…”

Section: Introductionmentioning

confidence: 99%

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Quad‐mode radial uniform circular array antenna for OAM multiplexing

Yoo

Son

2020

IET Microwaves, Antennas & Propagation

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This study presents a novel radial uniform circular array (UCA) antenna for quad‐mode orbital angular momentum (OAM) multiplexing in the 5.2 GHz band. The antenna can simultaneously generate four OAM modes (±1, ±2) using two radial UCAs printed concentrically on a single substrate. Each UCA is connected to an individual dual‐mode feeding network, and generates a pair of complementary OAM modes. The feeding network for each UCA consists of one quadrature hybrid coupler and two circular feedlines, and they can be integrated onto a single substrate. The measured radiation patterns and helical phase wavefronts show the successful generation of four OAM modes by the proposed antenna. The quad‐mode OAM transmission test was performed using two prototypes of the proposed antenna, and good isolations >13.7 dB were obtained between four OAM mode channels, which demonstrates that the antenna can be successfully used for OAM multiplexing.

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Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Quad‐mode radial uniform circular array antenna for OAM multiplexing

Yoo

Son

2020

IET Microwaves, Antennas & Propagation

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“…The authors highlighted intrinsic limitation for OAM radio communication and equally raised questions on the concepts of gain and signal propagation losses. Authors of [254] emphasized that LoS radio OAM transmission through [60], can only deliver spectral efficiency similar to the traditional spatial multiplexing approach only if a perfect alignment is established. Any small misalignment in the positions of the arrays will lead to a significant performance degradation.…”

Section: E Rf Challengesmentioning

confidence: 99%

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Trichili

Park

Zghal

et al. 2019

IEEE Commun. Surv. Tutorials

191

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Time, polarization, and wavelength multiplexing schemes have been used to satisfy the growing need of transmission capacity. Using space as a new dimension for communication systems has been recently suggested as a versatile technique to address future bandwidth issues. We review the potentials of harnessing the space as an additional degree of freedom for communication applications including free space optics, optical fiber installation, underwater wireless optical links, on-chip interconnects, data center indoor connections, radio frequency and acoustic communications. We focus on the orbital angular momentum (OAM) modes and equally identify the challenges related to each of the applications of spatial modes and the particular OAM modes in communication. We further discuss the perspectives of this emerging technology. Finally, we provide the open research directions and we discuss the practical deployment of OAM communication links for different applications. ). 4 in the future. We also summarize the open problems and the future research directions. A discussion of the practicability and cost of multi-OAM communication is also included. II. OAM POTENTIALS A. Free Space Optical CommunicationFSO is a license free wireless communication configuration that has recently received much interest for a variety of applications. FSO is an attractive solution for last mile connectivity problems, particularly for communication networks, when the installation of fiber optics is costly or not possible [66]. FSO can be also used to establish inter-building secure communication, and can be deployed as a backup to optical fibers. Wireless optical communication can guarantee a line-of-sight (LoS) high bit rate wireless transmission over long distances, up to several kilometers. Furthermore, FSO communication is considered as a promising technique to scale down bandwidth challenges in future 5G networks [67].Multiple wavelength FSO provides better transmission, as demonstrated in [68], [69]. Data can be mapped on advanced modulation formats to achieve high bit rates and high spectral efficiency levels [70]- [72]. Another option is multiple-input and multiple-output (MIMO) FSO communication in which multiple lasers are positioned to transmit Gaussian beams to multiple receiving apertures [73]. Over the last few years, it has been proven that it is possible to transmit information over spatially structured light beams [21], [74], [75] including OAM beams and plane waves. Our focus is on the OAM modes of light.The first PoC communication experiment incorporating OAMs in free space was carried out in 2004 by Gibson and co-workers [21]. Over a 15-meter long link, 8 -spaced values were chosen along the Gaussian beam as an alphabet for the communication. OAM beams were generated and detected using two light modulators. Since then, much progress has been made and free space transmission capacity of over 1 Tbit/s is, today, possible [76]- [78]. By performing three dimensional multiplexing, Huang and co-workers were able to attain a 100 Tbi...

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“…The metasurface using a ringsurrounded bowtie patch as a cell in [21] was adopted to generate multiple OAM modes of = 0, 1 and 2. In [22] and [23], the circular antenna arrays with two feeding networks were employed to achieve two-OAM-mode radiation patterns. While only one phase-shifting feeding network was used in [24] to realize the OAM modes of = ±1.…”

Section: Introductionmentioning

confidence: 99%

Rotman Lens-Fed Antenna for Generating Multiple Orbital Angular Momentum (OAM) Modes With Gain Enhancement

Zhang

et al. 2020

IEEE Access

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A compact multi-layer Rotman lens-fed array antenna which can generate nine orbital angular momentum (OAM) modes is presented in this paper. The proposed antenna consists of a microstrip Rotman lens and a nine-element circular array antenna which utilizes high-gain patch element in order to enhance the gain of OAM beam. A stacked patch loaded with two slots is attached above the patch element to effectively enhance the antenna gains. By employing the Rotman lens as the feed network of the circular array, nine OAM-carrying beams of modes number = 0, ±1, ±2, ±3 and ±4 can be produced when different input ports are excited, respectively. 160 •-phase-shift on adjacent output ports can be achieved to meet the phase requirement of OAM modes of = ±4. Moreover, the Rotman lens is modified by adjusting the deflection angle of the beam ports and array ports so as to achieve uniform amplitude distribution on the output ports. Hence, the pattern characteristics of OAM beams can be effectively improved by making all the output ports are equal in amplitude. The C-band prototype of the antenna is fabricated and measured. Both the simulation and measurement results indicate that nine OAM modes can be generated by using the proposed structure. The proposed antenna can be used in an OAM-based wireless communication system. INDEX TERMS OAM, Rotman lens, circular array antenna, high-gain antenna.

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Radial Uniform Circular Antenna Array for Dual-Mode OAM Communication

Cited by 115 publications

References 12 publications

Quad‐mode radial uniform circular array antenna for OAM multiplexing

Quad‐mode radial uniform circular array antenna for OAM multiplexing

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Rotman Lens-Fed Antenna for Generating Multiple Orbital Angular Momentum (OAM) Modes With Gain Enhancement

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