Abstract
The generation of the focused orbital angular momentum (OAM) beams using concentric uniform circular array (CUCA) is proposed in this paper. Since the ring shaped beams of the traditional electromagnetic (EM) vortex wave diverge along the propagation axis, only part of the beam is utilized for target detection, leading to a low efficiency. In this paper, two schemes are proposed to generate the focused OAM beams using concentric uniform circular antenna array (CUCA). Different from the traditional beam convergence method by reducing the divergence angle using parabolic reflector or lens, the proposed method employs a group of OAM beams with same divergence angle so that the superposed beam is focused at a certain azimuth angle. The feed amplitudes and phases of the elements of CUCA are firstly designed and validated using array factor multiplication. Then full wave simulations are conducted based on multilevel fast multipole algorithm (MLFMA) to calculate the radiation patterns and near field distributions of CUCA consist of micro strip patch antenna to further validate the proposed schemes. Simulation results indicate that the focused OAM beam can be achieved and the phase of the radiated field keeps the vortex property.
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