Structure Radio Beam Construction in Azimuthal Domain

Abstract

Structure radio beams with diverse radiation patterns exhibit huge potentials in many applications. In this paper, we propose a plane spiral orbital angular momentum (PS-OAM) based structure radio beam construction scheme, in which several PS-OAM waves are superposed together to acquire the anticipated radiation pattern and phase distribution in azimuthal domain. Firstly, some typical shapes of the radiation patterns are demonstrated. Then, the properties of this kind of structure radio beam, for example diversity, periodicity, vorticity and directional gain are analysed in detail from mathematical analysis and simulation verification. Finally, a proof of principle experiment is carried out at 10 GHz using a multi PS-OAM antenna to further testify the feasibility of the structure radio beam construction. The interesting properties provided by structure radio beams would offer promising solutions to radar imaging, smart antenna, massive multiple input multiple output (MIMO) and spatial modulation multiple input multiple output (SM-MIMO). INDEX TERMS Structure radio beam, radiation pattern, orbital angular momentum, diversity, vorticity. I. INTRODUCTION

Energy Efficiency Optimization for PSOAM Mode-Groups Based MIMO-NOMA Systems

“…At the receiver, each user is equipped with N r = 2 receiving antennas, which are placed within the main lobe of the superposed PSOAM MGs waves. Due to the orthogonality of different PSOAM mode groups in the main lobe zone [19], there is no interference between each different PSOAM mode group. However, since all users share the same bandwidth, the interferences among the users can not be ignored when decoding the signals for the same PSOAM mode group.…”

“…is a constant that related to the antenna gain of the n th t transmitting antenna and the n th r receiving antenna. Specifically, the interference of the n th t transmitting antenna to the other K −1 non-intended users can be calculated by the antenna gain according to the amplitude and phase distribution of the PSOAM MGs wave [19]. G t can be determined by the distribution of the users and the interference of the minor lobe.…”

“…To solve the equivalent problem in (19), we first obtain the γ * EE . Then, we have the following proposition.…”

“…This work was extended to realize a high-purity eight-mode PSOAM antenna using a rotating parabolic reflector and a coaxial resonator group [18]. The authors in [19] have further studied the peculiarity of PSOAM MGs and demonstrated the intensity patterns and the phase variation, which offered a potential application prospect for beamforming and radar imaging.…”

Generation of plane spiral orbital angular momentum using circular double-slot Vivaldi antenna array

“…The PSOAM beam propagating along the transverse direction inherits the vorticity and orthogonality of the traditional OAM beam. The PSOAM beams with different modes have the same 180° divergence angle and can propagate in the same direction, which easily realize multi-mode synthesis, then avoid the problem of beam divergence inconsistency 9 , 10 . Although the PSOAM shows the above advantages over traditional OAM, current research on the PSOAM antenna is far from adequate.…”