Time, polarization, and wavelength multiplexing schemes have been used to satisfy the
growing need of transmission capacity. Using space as a new dimension for communication …

In this paper, we review the generation of vortex beams carrying orbital angular momentum
in the microwave domain. We firstly present the theory of Laguerre–Gaussian beams where …

In this paper, an electromagnetic metasurface is designed, fabricated, and experimentally
demonstrated to generate multiple orbital angular momentum (OAM) vortex beams in radio …

Metasurfaces deployed for generating electromagnetic waves that carry orbital angular
momentum (OAM) in the transmission mode are generally inefficient in operation. In this …

A novel radar imaging technique based on orbital angular momentum (OAM) modulation is
presented. First, the generation of electromagnetic (EM) vortex wave, which carries the OAM …

Vortex beams have been extensively realized using different approaches. Typically, the
efficiency and bandwidth of a vortex beam are limited by impure copolarized components …

A circular phased array antenna that can generate orbital angular momentum (OAM) radio
beams in the 10 GHz band is described. The antenna consists of eight inset‐fed patch …

There is a continuing growth in the demand for data bandwidth, and the multiplexing of
multiple independent data streams has the potential to provide the needed data capacity …

Communications using the orbital angular momentum (OAM) of radio waves have attracted
much attention in recent years. In this paper, a novel millimeter-wave dual OAM mode …

A traveling-wave circular loop antenna with its phase distribution along the circle of is
demonstrated to generate the twisted radio wave. Theoretical formulations of its radiation …