Transactions of Nanjing University of Aeronautics & Astronautics
A Wide-Spaced Dual-Band Metamaterial Absorber Based on 2.5D Frequency Selective Surfaces and Magnetic Material
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Abstract:
By applying meander-line for electrical loss and magnetic material for magnetic loss， we present a metamaterial absorber which is wide-spaced and dual-band （1.35—2.24 GHz and 10.37—12.37 GHz）. The novelty of this study mainly lies in a combination of two kinds of losses to consume electromagnetic energy， which can get better dual-band absorption. In the electrical loss layer， meander-line structures are printed on both surfaces of the substrate and the structure series with resistors. Considering the need for miniaturization， we connect eight metallic vias with these meander-line areas to form a compact 2.5-dimensional （2.5D） structure. The dimension of the unit cell is miniaturized to be 5.94 mm×5.94 mm， about 0.035λ at the center frequency of the lower absorption band. In the magnetic loss layer， the 0.4 mm thick magnetic material is employed on a metallic ground plane. In addition， the complex permittivity and complex permeability of the magnetic material are given. Finally， we fabricate a prototype of the proposed absorber and obtain a measurement result which is in good agreement with the full-wave simulation result.
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Clc Number:
TN827
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