title: Experimental Array for Generating Dual Circularly-Polarized Dual-Mode OAM Radio Beams.
abstract: Recently, vortex beam carrying orbital angular momentum (OAM) for radio communications has attracted much attention for its potential of transmitting multiple signals simultaneously at the same frequency, which can be used to increase the channel capacity. However, most of the methods for getting multi-mode OAM radio beams are of complicated structure and very high cost. This paper provides an effective solution of generating dual circularly-polarized (CP) dual-mode OAM beams. The antenna consists of four dual-CP elements which are sequentially rotated 90 degrees in the clockwise direction. Different from all previous published research relating to OAM generation by phased arrays, the four elements are fed with the same phase for both left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The dual-mode operation for OAM is achieved through the opposite phase differences generated for LHCP and RHCP, when the dual-CP elements are sequentially rotated in the clockwise direction. The measured results coincide well with the simulated ones, which verified the effectiveness of the proposed design.
authors.affiliation: Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.|China Academy of Aerospace Electronics Technology, Shanghai Aerospace Electronics Co., Ltd, Shanghai 201821, China.
authors.forename: Xu-Dong
authors.initials: XD
authors.lastname: Bai
authors.affiliation: Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Xian-Ling
authors.initials: XL
authors.lastname: Liang
authors.affiliation: China Academy of Aerospace Electronics Technology, Shanghai Aerospace Electronics Co., Ltd, Shanghai 201821, China.
authors.forename: Yun-Tao
authors.initials: YT
authors.lastname: Sun
authors.affiliation: China Academy of Aerospace Electronics Technology, Shanghai Aerospace Electronics Co., Ltd, Shanghai 201821, China.
authors.forename: Peng-Cheng
authors.initials: PC
authors.lastname: Hu
authors.affiliation: Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.affiliation: Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Jun-Ping
authors.initials: JP
authors.lastname: Geng
authors.affiliation: Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Rong-Hong
authors.initials: RH
authors.lastname: Jin