Abstract
A novel metamaterial absorber design able to operate in the C frequency band is presented, along with an analysis and a method to improve both its bandwidth and its angular stability. Simulation results for a FR4-based design are shown for comparison with existing designs. In addition, a simplified equivalent circuit is provided for a better understanding of the great angular stability and wide bandwidth exhibited by the proposed structure. Moreover, simulations, manufacturing and measurements of a thinner and more flexible metamaterial absorber, keeping the angular stability of the former one, while providing a wide bandwidth, are presented.
Highlights
Metamaterial absorbers (MMA) have been attracting attention in recent years [1,2,3,4,5,6,7,8,9,10,11] due to their capabilities of almost perfectly absorbing electromagnetic radiation through low profile periodic structures
Both ε2 and μ2 are directly related to the material losses, which are the key issue for achieving absorption in an MMA
FR4 with a relative permittivity εr = 4.1, a thickness d = 1 mm and a loss tangent tanδ = 0.025 is chosen as the dielectric substrate for the starting design, since it is widely used by other authors in previous works [1,2,4,5,7,8,17]
Summary
Metamaterial absorbers (MMA) have been attracting attention in recent years [1,2,3,4,5,6,7,8,9,10,11] due to their capabilities of almost perfectly absorbing electromagnetic radiation through low profile periodic structures. A metamaterial can be described as an effective medium [5,7,10,15,16,17], with a complex electric permittivity ε(w) = ε1(w) + jε2(w) and a complex electric permeability μ(w) = μ1(w) + jμ2(w) Both ε2 and μ2 are directly related to the material losses, which are the key issue for achieving absorption in an MMA. Another important consideration is the need for impedance matching to free space to obtain zero reflection. This can be achieved by matching the permeability and the permittivity ( Z ( w) ) of ( w) the MMA
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