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Abstract

Three kinds of absorbers, based on square metal patch structure(SMP) metamaterials, resistance frequency selective surface (RFSS), and the combined SMP with RFSS structures, are designed, respectively. The absorptivities of these absorbers are simulated and analyzed by FDTD method. The simulation results indicate that in a frequency range of 230 GHz, SMP absorber can achieve stronger multi-bands absorption by the proper design of geometrical parameters of unit cell; RFSS absorber can achieve stronger high-frequency broadband absorption by the proper design of the square resistance of unit cell. However, the bandwidth of stronger absorption is limited; the absorption of the composite absorber combined with SMP and RFSS structure is greater than 90% in a frequency range of 325 GHz, which has a characteristic of better impedance matching to the free space in a wide frequency range.

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Funds:Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20090142120003).

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Vol. 61, Issue 13 - 2012-07-05

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