基于光固化的BVN/树脂金刚石结构EBG制备方法及其微波传输性能

Method of Manufacturing Diamond-structure BVN/resin EBG Based on Stereolithography and Its Microwave Transmission Performance

研究一种微波频段三维电磁带隙(Electromagnetic band gap,EBG)结构的快速成型方法。该方法结合光固化成型技术与凝胶注模工艺,以光固化快速成型技术制造金刚石结构的负型模具,凝胶注模工艺成型陶瓷零件,可用于制备三维金刚石电磁带隙结构;微波频谱测试表明,制备得到的EBG的带隙范围在10.24～12.22 GHz,与理论计算的带隙一致;用Micro-CT三维重建显示,内部结构连续完整,线性密度均匀稳定,制造和测试结果显示基于光固化的制造方法能够实现三维EBG的快速、精确制造并展示其真实微波传输特性。采用光固化成型与凝胶注模相结合的制备工艺为三维EBG结构快速制备及其性能研究提供了一条有效途径。

A method manufactured rapidly three-dimension electromagnetic band gap （EBG） structure is studied. In this process, combining stereolithograph（SL） and gel-casting, diamond-structure negative molds are fabricated using SL technology and ceramic parts are formed by gel-casting, in which three-dimension EBG with diamond structure could be fabricated. The test of microwave frequency spectrum shows that, bandgap of the EBG structures is between 10.24-12.22 GHz, matching close with that designed theoretically. Three-dimensional EBG structure reconstructed with micro-CT shows that their internal structure is intact, and linear density is uniform and stable. Manufactured and tested results display the manufacturing method based on SL could achieve to manufacture rapidly and precisely three-dimensional EBG structure and demonstrate its true microwave transmission performance. The technique combining SL and gel casting provides an efficient method to rapidly manufacture three-dimension EBG structure and research its microwave transmission performance.