Utilization of Photon Orbital Angular Momentum in the Low-Frequency Radio Domain
Utilization of Photon Orbital Angular Momentum in the Low-Frequency Radio Domain
We show numerically that vector antenna arrays can generate radio beams that exhibit spin and orbital angular momentum characteristics similar to those of helical Laguerre-Gauss laser beams in paraxial optics. For low frequencies ($\ensuremath{\lesssim}1\text{ }\text{ }\mathrm{GHz}$), digital techniques can be used to coherently measure the instantaneous, local field vectors and …