通过把3种不同尺寸的L-bridge单元进行组合,在多层PCB板的电源层上,设计了一种新的多周期平面型超宽带电磁带隙(Electromagnetic Band Gap,EBG)结构,可用于抑制数字电路系统中的同步开关噪声(Simultaneous Switching Noise,SSN)。利用HFSS软件对该EBG结构进行了建模和仿真,并在仿真基础上制作了电路实物,实测与仿真结果吻合良好。组合结构EBG比传统L-bridge EBG的阻带宽度有明显提高,当抑制深度为-40 d B时,具有从0.8 GHz到9.5 GHz的超宽带阻带特性。 By combining three L-bridge units of different sizes, a new multi-period planar ultra-wide band electromagnetic bandgap (EBG) structure is designed on the power plane of multi-layer PCB Suppress Simultaneous Switching Noise (SSN) in digital circuitry. The EBG structure was modeled and simulated by HFSS software, and the real circuit was made on the basis of simulation. The measured and simulation results were in good agreement. Compared with the traditional L-bridge EBG, the EBG has a significantly improved stopband width, with an ultra-wideband stopband from 0.8 GHz to 9.5 GHz with a suppressed depth of -40 dB.