Open AccessExperimental Array for Generating Dual Circularly-Polarized Dual-Mode OAM Radio Beams
Author(s) -
Xudong Bai,
Xianling Liang,
Yali Sun,
Pengcheng Hu,
Yao Yu,
Kun Wang,
Junping Geng,
Ronghong Jin
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep40099
Subject(s) - optics , physics , polarization (electrochemistry) , circular polarization , angular momentum , dual (grammatical number) , antenna (radio) , phase (matter) , circular buffer , clockwise , telecommunications , computer science , art , chemistry , literature , quantum mechanics , programming language , microstrip , amplitude
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.