【作者】 张骅；

【导师】 路宏敏；

【作者基本信息】 西安电子科技大学 ， 环境科学， 2011， 硕士

【摘要】 电磁带隙(Electromagnetic Band Gap,EBG)结构是一种具有带阻、慢波、高阻抗特性的周期性结构,在一定的带宽范围内可以阻止电磁波传播;另外它具有制作简单、体积小、重量轻、便于集成等优点。因此,受到广泛关注和深入研究。本文主要研究抑制电磁干扰的电磁带隙(EBG)结构,包括抑制表面波的高阻表面EBG结构和抑制同步噪声干扰的共面型EBG结构。本文首先研究了紧凑型高阻表面EBG结构。应用基于有限元法的Ansoft HFSS软件,用不同的方法分析适合于平面电路集成的高阻抗表面mushroom-EBG结构。在经典mushroom EBG结构的基础上,按照EBG结构小型化的要求,提出了新型紧凑型高阻表面EBG结构,并对其带隙特性进行了研究,新结构具有良好的紧凑性,在新结构的基础上,利用组合单元法,设计了宽带高阻表面EBG结构。将新结构应用于抑制微带天线间互耦,取得了良好的效果。本文对抑制同步噪声干扰(SSN)的共面型EBG结构的带隙特性进行了分析对比,在此基础上,提出了新型超宽带抑制同步开关噪声的共面型EBG结构。实测与仿真结果均表明该EBG结构能有效地抑制SSN,取得了理想的效果。最后又对其信号完整性进行了分析,得出了应用新型EBG结构来抑制SSN,不会对PCB信号完整性造成太大影响的结论。更多还原

【Abstract】 EBG (Electromagnetic Band Gap) structure is a periodic structure with the characteristics of band-stop, slow-wave, and high-impedance. It can prohibit the propagation of the electromagnetic wave in a certain bandwidth range. Being simply made, small size, light weight and ease of integration, it attracts widespread attention and receives in-depth study.The thesis mainly focuses on EBG structures used for electromagnetic interference suppression, including HIS EBG structures used for surface wave suppression and uniplanar EBG structures used for simultaneous switch noise suppression.HIS EBG structures used for surface wave suppression are firstly studied. Ansoft HFSS software which is based on the finite element method is used to simulate the EBG structures. As a typical, mushroom-EBG structure which can be integrated with PCB is analyzed in different methods. On the basis of mushroom-EBG structure, we proposed a novel compact EBG structure. Simulation results show the structure has a winning feature of compactness.“United cells method”is applied in the novel structure to broaden its bandwidth. The novel structure is successfully used to reduce surface-wave losses for a double-element microstrip antenna array and a 3.5 dB reduction of mutual coupling is achieved.Different kinds of uniplanar EBG structures are analyzed. According to simulation result of EBG structure which is mentioned above, a novel uniplanar EBG structure is proposed with ultra--wideband suppression of simultaneous switch noise (SSN) from 270 MHz to 15 GHz. The measured results are in good agreement with simulated results. Good signal integrity performance can be obtained by using differential transmission lines.更多还原