@inproceedings{33dfe70add394c73a9b3f2a384ef785e,
title = "High-Purity OAM Generation via Bidirectional Folded Transmitarray Metasurface",
abstract = "This paper proposes a low-profile, broadband, and bidirectional folded transmitarray metasurface for orbital angular momentum (OAM) generation. The proposed metasurface integrates two broadband circularly polarized (CP) magnetoelectric dipoles within a dual-layer receiver-transmitter (Rx-Tx) architecture. This configuration enables independent manipulation of the transmission and reflection phases through element rotation. Unlike conventional designs relying on specular reflection, a reflection-phase compensation strategy is introduced to substantially reduce the overall structural profile. The proposed metasurface generates high-purity (>93\%) circularly polarized vortex beams with topological charges of l = +2 in the forward direction and l = +1 in the backward direction over the operating frequency range of 12.5-17 GHz. These results demonstrate the strong potential of the proposed structure for compact and miniaturized OAM-based communication systems.",
keywords = "Metasurface, antenna, circular polarization, folded transmitarray, orbital angular momentum (OAM)",
author = "Jiaxuan Deng and Chenyang Dang and Rong Niu and Zhaorui Wang and Haoyang Xu and Xiue Bao and Houjun Sun and Liming Si",
note = "Publisher Copyright: {\textcopyright} 2026 IEEE.; 13th IEEE MTT-S International Wireless Symposium, IWS 2026 ; Conference date: 09-05-2026 Through 12-05-2026",
year = "2026",
doi = "10.1109/IWS69027.2026.11674788",
language = "English",
series = "2026 IEEE MTT-S International Wireless Symposium, IWS 2026 - Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2026 IEEE MTT-S International Wireless Symposium, IWS 2026 - Proceedings",
address = "United States",
}