研究目的
To design anisotropic metamaterial wide angle impedance matching (WAIM) layers to reduce scan losses in active phased arrays for large scanning angles.
研究成果
The study presents an optimization procedure for designing anisotropic WAIM layers that improve the scanning performances of phased arrays. The proposed multilayer diamagneto-dielectric WAIM provides substantial improvements in radiated power at large scanning angles, especially on the H-plane, while keeping the active reflection coefficient below the required threshold.
研究不足
The study is limited by the constraints on the design parameters, which may lead to solutions difficult to realize using metamaterials. The magnetic response of MMs is limited by their narrowband and high angular dispersive behavior.
1：Experimental Design and Method Selection:
The design involves coupling a full-wave model of the active phased array with an analytical model describing the WAIM layers. The optimization process uses a cost function with adaptive weights to determine the optimal values of the design parameters.
2：Sample Selection and Data Sources:
The study uses an infinite periodic array of equal radiating elements excited with linear progressive phases. The radiated fields are expanded with a set of discrete Floquet modes.
3：List of Experimental Equipment and Materials:
The study utilizes the finite-element (FEM) solver of Ansys HFSS for full-wave simulations and MATLAB for constrained nonlinear optimization.
4：Experimental Procedures and Operational Workflow:
The optimization is performed over three planes (E-plane, D-plane, H-plane) using 5 frequency samples. The GSM of the array is computed and connected to the modal ports of the transmission lines representing the overlaying structure.
5：Data Analysis Methods:
The active input impedance or the active reflection coefficient at the input port of each radiating element is computed. The improvement in the active realized gain is analyzed through full-wave simulations.
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