Figure 4
From: Multiplexed Millimeter Wave Communication with Dual Orbital Angular Momentum (OAM) Mode Antennas
The fabricated dual OAM states antenna (l = ±3). (a) 3D printed (photosensitive polymer) antenna blank without metallization. (b) after the electro-less copper plating surface treatment process. The diameter of the ring focus parabolic reflector is ~50 mm.
