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Related Experiment Video

Updated: Sep 3, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Metasurface-based THz reflectarray antenna with vortex multiplexing and beam-steering capabilities for future

Ali Ali¹, Mohsen Khalily¹, Tim Brown¹

¹Department of Electrical and Electronic Engineering, 5G & 6G Innovation Centres (5GIC & 6GIC), Institute for Communication Systems (ICS), University of Surrey, Guildford GU2 7XH, UK.

|July 25, 2022

Summary

This study explores orbital angular momentum (OAM) beams using dielectric reflectarray antennas for terahertz (THz) communications. It introduces a novel method for 3D beam-steering and OAM multiplexing, enabling efficient THz indoor wireless systems.

Keywords:

Antennas Metamaterials Optical materials

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Area of Science:

Electromagnetics and Antennas
Terahertz (THz) Technology
Optical Communications

Background:

Orbital angular momentum (OAM) beams offer unique properties for advanced wireless communication systems.
Dielectric reflectarray antennas (RAs) provide a low-cost, high-gain platform for beam manipulation.
Terahertz (THz) frequencies present opportunities for high-bandwidth communication but face challenges in beam control.

Purpose of the Study:

To investigate the potential of dielectric reflectarray antennas for generating and manipulating orbital angular momentum (OAM) beams at the terahertz (THz) band.
To propose a novel paradigm for enabling 3D beam-steering and OAM multiplexing using a single reflectarray antenna structure.
To demonstrate the generation of single 3D steered OAM beams and multiple off-centered OAM beams with different modes.

Main Methods:

Utilizing a volumetric unit cell design for dielectric reflectarray antennas.
Accurate tuning of unit cells through the antenna aperture to achieve desired beam steering angles.
Developing a single structure capable of both 3D beam-steering and OAM multiplexing.

Main Results:

Successful generation of a single 3D steered OAM beam.
Demonstration of producing multiple off-centered OAM beams with distinct modes.
Achieving maximal attainable angles for directing OAM beams to different receivers or focusing them.

Conclusions:

The proposed paradigm effectively enables 3D beam-steering and OAM multiplexing using low-cost dielectric reflectarray antennas at THz frequencies.
This technology holds promise for advanced THz indoor communication systems requiring flexible and efficient beam control.
The developed reflectarray antennas are suitable candidates for next-generation THz wireless networks.