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A transmitarray enabling broadband high-purity OAM vortex beams in the Ka-band

Published online by Cambridge University Press:  14 February 2025

Muhammad Ishfaq ,
Xiuping Li ,
Zihang Qi Open the ORCID record for Zihang Qi [Opens in a new window] ,
Abdul Aziz ,
Wenyu Zhao ,
Abdual Majeed  and
Zahid Iqbal
Muhammad Ishfaq
Affiliation:
School of Electronic Engineering, The State Key Laboratory of Information Photonics and Optical Communications, the Key Laboratory of Universal Wireless Communications of Ministry of Education, the Beijing Key Laboratory of Work Safety Intelligent Monitoring, and the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Xiuping Li*
Affiliation:
School of Electronic Engineering, The State Key Laboratory of Information Photonics and Optical Communications, the Key Laboratory of Universal Wireless Communications of Ministry of Education, the Beijing Key Laboratory of Work Safety Intelligent Monitoring, and the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Zihang Qi
Affiliation:
School of Electronic Engineering, The State Key Laboratory of Information Photonics and Optical Communications, the Key Laboratory of Universal Wireless Communications of Ministry of Education, the Beijing Key Laboratory of Work Safety Intelligent Monitoring, and the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Abdul Aziz
Affiliation:
Department of Information and Communication Engineering, Faculty of Engineering and Technology, The Islamia University of Bahawalpur, Bahawalpur, Punjab 63100, Pakistan
Wenyu Zhao
Affiliation:
School of Electronic Engineering, The State Key Laboratory of Information Photonics and Optical Communications, the Key Laboratory of Universal Wireless Communications of Ministry of Education, the Beijing Key Laboratory of Work Safety Intelligent Monitoring, and the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Abdual Majeed
Affiliation:
School of Electronic Engineering, The State Key Laboratory of Information Photonics and Optical Communications, the Key Laboratory of Universal Wireless Communications of Ministry of Education, the Beijing Key Laboratory of Work Safety Intelligent Monitoring, and the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Zahid Iqbal
Affiliation:
School of Electronic Engineering, The State Key Laboratory of Information Photonics and Optical Communications, the Key Laboratory of Universal Wireless Communications of Ministry of Education, the Beijing Key Laboratory of Work Safety Intelligent Monitoring, and the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
*
Corresponding author: Xiuping Li; Email: [email protected]
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Abstract

This paper introduces a three-substrate layered transmitarray design that avoids the use of vias, aiming to produce broadband orbital angular momentum (OAM) vortex beams within the Ka-band. The suggested element configuration accomplishes a full 360∘ transmission phase while upholding a 1-dB transmission loss, with an overall thickness measuring 3.4 mm (equivalent to 0.34λ0 at 30.0 GHz). Its balanced unit cell arrangement amplifies its effectiveness in applications involving dual polarization. We examine the transmitarray behavior across four OAM modes (+1, +2, +3, +4 ), unveiling notable mode purity at operating frequency. Specifically, a broadband OAM vortex beam is achieved for the +1 mode during simulation. A square aperture transmitarray fed by a horn antenna is fabricated and measured to validate these simulated findings. Experimental results confirm the successful broadband vortex beam generation for $l = +1$ mode across the frequency spectrum from 27.0 to 40.0 GHz, approximately 43.3%. Additionally, the proposed transmitarray achieves a peak gain of 21.7 dBi, accompanied by an 11.8% aperture efficiency. Noteworthy is the consistent maintenance of mode purity above 86%.

Keywords

metasurfacemode purityorbital angular momentum (OAM)transmissivevortex beamwideband
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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