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设计和制作了一种基于十字微结构的吸波体,基本单元由十字微结构、羰基铁吸波贴片以及金属背板组成。采用基于时域有限积分法,仿真了十字微结构的结构参数对吸波贴片吸波性能的影响。仿真结果表明,保持吸波体总厚度2.5 mm不变的情况下,当吸波体单元尺寸p=20 mm、十字臂长L=6 mm、十字臂宽w=2 mm时,吸收峰最低值能达到-40 d B,~(-1)0d B以下吸收带宽从5.8~9.3 GHz移动到4.27~8.06 GHz;当吸波体单元尺寸p=20 mm、十字臂长L=9 mm、十字臂宽w=2mm时,吸波带宽最宽,~(-1)0 d B以下吸收带宽从5.8~9.3 GHz移动到3.5~8.5 GHz。十字微结构结构参数的改变极大地拓展了吸波贴片的吸波带宽,降低了共振频率的反射率。根据仿真结果,制备了样品并测试,测试结果与仿真结果一致。
A kind of wave absorber based on cross-sectional microstructure was designed and fabricated. The basic unit consisted of a cross-sectional microstructure, a carbonyl iron wave absorption patch and a metal backplane. Based on the finite-difference time-domain method, the influence of the structural parameters of the cross-sectional microstructure on the microwave absorbing performance of the absorber was simulated. The simulation results show that when the total thickness of the absorbing body is kept constant at 2.5 mm, the minimum value of the absorption peak is obtained when the size of the absorbing body unit is p = 20 mm, the length of the cross arm is L = 6 mm and the width of the cross arm is w = 2 mm The absorption band below 0dB can be reduced from 5.8 to 9.3 GHz to 4.27 to 8.06 GHz under the condition of -40 d B, -1 (superscript nd); when the unit size of the absorber is p = 20 mm and the length of the cross arm is L = 9 mm, The bandwidth of the absorption band is the widest when w = 2mm wide, and the bandwidth of absorption below ~ (-1) 0 d B moves from 5.8 ~ 9.3 GHz to 3.5 ~ 8.5 GHz. Changes in the cross-sectional microstructure parameters greatly expand the absorption bandwidth of the absorbing patch and reduce the reflectivity of the resonant frequency. According to the simulation results, the samples were prepared and tested, the test results are consistent with the simulation results.