title: Three-Dimensional Simultaneous Arbitrary-Way Orbital Angular Momentum Generator Based on Transformation Optics.
abstract: In wireless communications, people utilize the technology of diversity against multipath fading, so as to improve the reliability of communication equipment. One of the long-standing problems in diversity antennas is the limited number of diversity in a certain space. In this paper, we provide a solution to this issue by a three-dimensional (3D) simultaneous arbitrary-way orbital angular momentum (OAM) generator (3D SAWOG) based on transformation optics. The proposed 3D SAWOG consists of a metamaterial block and a group of transformation cylinders, by which arbitrary-way planar wavefronts can be converted to helical wavefronts with various topological charges simultaneously. The 2D four-way OAM generator and the 3D SAWOG are analyzed, designed, and simulated. The simulation results validate the performance of a 3D SAWOG successfully, indicating that the proposed model possess a high mode purity and expansibility. The SAWOG can be used as a novel diversity antenna array due to the orthogonal property among different modes, which could provide more degrees of freedom than traditional dual-polarization antennas, further improving the reliability of the communication systems.
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Li
authors.initials: L
authors.lastname: Deng
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Wei Jun
authors.initials: WJ
authors.lastname: Hong
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Wei Xiang
authors.initials: WX
authors.lastname: Jiang
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Jian Feng
authors.initials: JF
authors.lastname: Zhu
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Mi
authors.initials: M
authors.lastname: Zhou
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Shu Fang
authors.initials: SF
authors.lastname: Li
authors.affiliation: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China.|Beijing Laboratory of Advanced Information Network, University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Peng