一种新型的抑制同步开关噪声的超宽带电磁带隙结构

A Novel Electromagnetic Band-gap Structure with Ultra-wideband for Suppression of Simultaneous Switching Noise

针对抑制印刷电路板中电源平面与接地平面之间的同步开关噪声问题,文章提出了一种新型的二维电磁带隙(LS-EBG)结构。这一新型结构的设计基于在方形贴片上面刻蚀出L型缝隙以降低贴片的有效电容,应用折线以增加贴片的有效电感,单元晶格由折线与含有缝隙的正方形金属贴片桥接构成。电磁带隙仿真分析结果表明,相比于同参数的L-bridged EBG电磁带隙结构,在-30dB抑制深度时,LS-EBG结构阻带范围从290MHz到超过20GHz,相对带宽增加了约15%,阻带下限截止频率降低了310MHz。

To suppress the simuhaneous switching noise （SSN） within the power/ground planes of the printed circuit boards, a novel ultra-wideband planar electromagnetic band-gap （LS-EBG） structure is proposed. The novel design is based on etching out L aperture in the square patch to reduce patch effective capacitance, using meander lines to increase the effec- tive inductance of EBG patches, and the unit cell of the EBG power plane consists of one square patch with the slots and four meander line bridges. Simulation results indicate： compared to the L-bridged EBG structure with the same parameters, the - 30 dB suppression bandwidth of the LS-EBG ranges from 0.29 GHz to more than 20GHz, the relative bandwidth is increased by about 15% ,the lower cut-off frequency is decreased by 310MHz.