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A new dual-polarized Orbital Angular Momentum antenna is proposed with the capability of mode and frequency reconfigurability to pave the way for designing smarter OAM communication systems. At the first step, a dual-polarized Multiple-Input Multiple-Output (MIMO) antenna is introduced. Later, a 2×2 Uniform Circular Array (UCA) is considered using the mentioned MIMO antennas. Since each MIMO antenna owns two input ports, two 2×2 sub-UCA is obtained having orthogonal polarizations. Reconfigurable feeding networks can produce the necessary phase gradients for generating OAM modes +1 and -1 in each sub-UCA. Frequency-tunability of the structure is achieved due to the frequency-adjustability of MIMO antennas as well. According to the simulated results, the frequency tuning range is from 3.8 GHz up to 4.4 GHz, preserving the OAM characteristics. Maximum gains over 6.75 dBi are achieved over the band. Thus, the proposed systems, with tunability on mode and frequency, and having dual-polarized feature, is the new candidate for future intelligent OAM communications.
Naseri et al. (Sun,) studied this question.