Numerical and experimental generated data during project https://doi.org/10.1109/TAP.2025.3618746

The dataset was generated during a project aimed at developing a SIW-based dual-circularly polarized (CP) metasurface(MS) antenna with high gain and high isolation for millimeter-wave (MMW) applications. The orthogonal higher order modes (HOMs) TE230/TE320 are utilized to generate CP. A dual-CP cavity-backed antenna with curved slots serves as the primary radiator, whereas a 4 4 square patch MS is employed as a superstrate. The characteristic mode analysis (CMA) of the antenna is utilized to identify and align the HOMs with a 90 phase di erence to enable dual-CP radiation. CMA is also applied to the MS to synthesize modalphase di erences of the primary antenna’s modes, enabling broadband phase compensation. The MS height is optimized to induce a 180 phase-shifted reflection, canceling undesired coupled fields and enhancing port isolation. Additionally, the symmetric electric field distribution across the MS improves broadside gain and suppresses cross-polarization.