Generation of OAM Radio Waves in C-Band by Using Hexagonal-Lattice Transmit-Array Lens

A novel hexagonal metamaterial unit cell is presented to construct the honeycomb transmit-array lens (TAL) generating the convergent orbital angular momentum (OAM) beams in C-band. Compared with the most common square-lattice arrays, the proposed honeycomb TAL can provide a wider operating band, a larger phase-shift range and stable frequency responses as the function of angle and polarization of the incident EM wave. The simulated results verify the effectiveness of the proposed design.