Magnetoelectric Dipole Antenna Framework Supporting Orbital Angular Momentum Modes

The ability to use resources to meet the need of growing diversity of communication services and user behavior marks the future of cognitive wireless communication systems. Cognitive wireless technologies for vehicular communications in combination with orbital angular momentum (OAM) modes aim at extending non-line-of-sight (NLOS) short-distance communications for smart mobility. In this regard, OAM antenna frameworks need to be developed to support these technologies. In this work, we describe a magnetoelectric dipole antenna framework supporting OAM modes. The framework is derived from moment tensors of specific vector spherical harmonic (VSH) functions synthesized from dipoles. The antenna framework is discussed in terms of OAM generation, and it is validated numerically and experimentally for
$l=1$
OAM mode, achieving more than 500-MHz operation bandwidth at the frequency of operation of 3.5 GHz. In addition, for
$l=1$
OAM mode, the null aligns precisely with the anticipated dimensions numerically computed.