In this letter, a novel dual-band metamaterial absorber is presented and analyzed. The absorber is composed of four patches on the top of a thin grounded dielectric substrate which can absorb incident wave at two difierent frequency bands efiectively. Then the absorber is loaded on the dual-band microstrip antenna, whose working frequency bands are overlapped with that of the absorber, to reduce the in-band RCS (Radar Cross Section) of antenna. The prototype is simulated, manufactured and measured. Simulated results show that the absorption of the absorber is as high as 98.6% at 4.29GHz and 99.8% at 6.49GHz. As to the dual-band antenna loaded with the proposed absorber, its radiation performance is unchanged while the RCS has declined by 8.59dB at 4.29GHz and 9.9dB at 6.49GHz respectively. There is a good agreement between simulated and measured results, which verifles that this absorber can be used for in-band RCS reduction of dual-band antenna so as to improve its in-band stealth performance.
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Zhang et al. (2014) studied this question.
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