Figure 6
From: Multiplexed Millimeter Wave Communication with Dual Orbital Angular Momentum (OAM) Mode Antennas

The near-field radiation for OAM states of l = ±3. (a)~(d) are the measured results; (e)~(h) are the simulation results. (a), (c), (e) and (g) are the amplitudes of the radial component of the electric field and (b), (d), (f) and (h) are the phase of the radial component of the electric field.