基于微滴喷射成形的多层超材料吸波体设计与制造

Design and fabrication of multilayer wideband metamaterial absorbers with micro droplets jetting printing

超材料吸波体朝着多频、宽频的方向发展,多层结构是其增加吸收带宽的重要手段,但对于传统刻蚀加多层粘结的制备方法,其精度难以保证。提出一种基于3D打印技术中微滴喷射成形(MJM)技术制备多层超材料吸波体的新方法,可以一体化成形吸波体结构。首先开展4层吸波体方案设计及吸收率仿真,分析光敏树脂的介电常数/介电损耗、银浆电导率对吸波性能的影响;然后通过制备20×20单元吸波体样品,将实测数据与仿真数据进行对比。实测数据表明,在10.4~19.6 GHz频率范围内的吸收率大于90%,完全覆盖Ku波段,且与仿真数据高度一致,证实了采用MJM技术可以一体化成形多层超材料吸波体结构,减少装配误差,在隐身结构制造领域具有潜在应用价值。

Metamaterial absorbers(MA)are developing towards multi-frequency or broadband,and multilayer structure is an important way to increase bandwidth of metamaterial absorbers.However,multilayer structure leads to complicated fabrication procedure as the accuracy cannot be guaranteed.This paper proposed a 3D printing,multilayer MAs based on micro-droplet jetting printing tenichque,which can form the structure of absorber in an integrated way.Firstly,the scheme design of four-layer absorber and the simulation of the absorbing rate were carried out,and the effects of the dielectric constant/dielectric loss of photosensitive resin and the conductivity of silver paste on the absorbing properties of MAs were analyzed.In addition,20×20 units absorber samples were prepared and compared with the simulation results.The results indicate that the absorption of this absorber is greater than 90%in the frequency range of 10.4-19.6 GHz,which covers Ku band fully.Most importantly,the micro-droplet jetting printing provides a new way for fabrication of multilayer wideband MAs and assembly error was reducd,which has potential in the field of stealth manufacturing.