研究目的
Investigating the electromagnetic properties and range of frequency reconfigurability of metasurface-enabled frequency reconfigurable antennas.
研究成果
The proposed RHM displays better performance in accuracy, robustness, and simplicity compared to the traditionally isotropic and anisotropic models. The frequency reconfigurable range is relevant to the anisotropy of the MS, i.e., the geometrical symmetry of the unit cell.
研究不足
The study focuses on the impedance property of the antenna and does not show the radiation properties, including far-field patterns and gains. The practical MS is finite in size, different from the simulation setup where it is assumed to be infinitely large.
1：Experimental Design and Method Selection:
The study proposes an equivalent radially homogeneous model (RHM) for characterizing metasurface-enabled frequency reconfigurable antennas. The retrieval process is formulated to address the polarization dependence of the retrieved effective electromagnetic parameters.
2：Sample Selection and Data Sources:
Three MSFR antennas composed of the same slot feed antenna and different metasurfaces with similar unit cells are designed as testing examples.
3：List of Experimental Equipment and Materials:
The antennas are modeled in CST, and their geometrical details are displayed. RO4350B with a thickness of 1.524mm and relative permittivity of εr = 3.48 is selected to model both the slot antenna and the MS.
4：524mm and relative permittivity of εr = 48 is selected to model both the slot antenna and the MS.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The unit cell boundary condition has been applied in CST to model the MSs and to generate the required S-parameters under the illumination of plane waves with proper polarization, imitating the scenarios when the MSs rotates with respect to the slot antenna at θR = 0?, 30?, 60?, and 90?.
5：0?.
Data Analysis Methods:
5. Data Analysis Methods: The retrieved εeff and μeff of the isotropic model at different θR are obtained by the NRW method. The effective EM parameters of the isotropic and the anisotropic models are determined, and those of the RHM are also fixed.
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