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Analysis shows effective dual band transmission coefficients above 0.8 in a metasurface for OAM beams, indicating potential for multi-band applications.
An efficient dual band transmission metasurface capable of generating OAM beams of different orders in the K‐band and Ka‐band is designed. The proposed metasurface unit consists of an intermediate dielectric substrate layer and two metal resonators for top and bottom layers. By adjusting the rotation angles of different resonators, the circularly polarized transmission phase at the K‐band and Ka‐band can be controlled independently, with both transmission coefficients larger than 0.8. By using this unit, a metasurface array that generates + 1 order OAM beam at the K‐band and + 2 order OAM beam at the Ka‐band is realized. Experimental results show that the generated OAM beams exhibit excellent performance, with measured main mode purity at the these two test frequencies is 0.71 and 0.7, respectively. This study provides a solution for generating multi‐band OAM beams.
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Wang et al. (2025) studied this question.
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