Abstract
Unit cells are the building blocks for creating the metamaterial periodic surface. Generally, the metamaterial unit cell exhibits the negative value of permittivity and permeability. Determination of metamaterial scattering parameters is the important step involved in the design of periodic structures. Here, a square-shaped unit cell having two loops is analyzed by placing on the FR4 substrate. The overall dimension of the substrate is 7 mm × 7 mm × 0.25 mm. Step-by-step procedure is done to optimize the unit cell which is suitable to extract the metamaterial properties are proposed. Unit cell is simulated using high-frequency structured simulator (HFSS) version HFSS 2020 R2, and the results are exported for the parameter retrieval. Scattering parameter retrieval method is used to analyze the unit cell with proper dimension and boundaries. Permittivity and permeability of the double-loop unit cell with and without split rings were determined using MATLAB R2020a program from the exported data of the simulations done. Extracted parameters of all the different combinations are compared and the metamaterial properties are determined for each unit cells.
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