十字微结构对羰基铁橡胶吸波贴片吸波性能的影响

Effect of the Cross Microstructure on Absorbing Properties of Carbonyl Iron Rubber Radar Absorbing Patch

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 radar absorber is designed and produced based on cross microstructure, which is composed of a cross microstructure, carbonyl iron rubber radar absorbing patch and metal backboard composition. Numerical simulation of effect of the cross microstructure on absorbing properties of carbonyl iron rubber radar absorbing patch is performed by means of the time domain finite integral method. Simulated results indicate that by using the total thickness of the holding absorber 2. 5 mm unchanged, when the absorber unit size p =20 mm, cross arm length L - 6 mm, cross arm width w - 2 mm, the minimum absorption peak the value can reach - 4 0 d B ,- 1 0 dB absorption band shifted from 5. 8 ？9. 3 GHz to 4. 27 ？8. 06 GHz; when the absorber unit size p -20 mm, cross arm length L -9 mm, cross arm width w -2 mm, having the widest absorbing bandwidth, - 10 dB absorption band shifted from 5. 8 ？9. 3 GHz to 3. 5 ？8. 5 GHz,changing the parameters of cross microstructure greatly expand the absorb-ing bandwidth microwave absorbing patch, reduce the reflectivity of resonance frequency. According to the simula-tion results, the samples are prepared and tested. The test results are in agreement with the simulation results.