Analysis of the Electromagnetic Band-gap Structure for Simultaneous Switching Noise Suppression and Transmission Characteristic in High-speed Printed Circuit Board
Jiang Dong-chu①② Li Yu-shan① Lu Jian-min① Ding Tong-hao①
①(Institute of Electronic CAD, Xidian University, Xi’an 710071, China) ②(School of Electronic Engineering, Hunan City University, Yiyang 413000, China)
Abstract：The characteristics of the Electromagnetic Band-Gap (EBG) structure composed of regular hexagonal patches is analyzed in the frequency domain and time domain. Respective influences of the side length of patches, space between patches and the radius of vias on the band-gap and transmission characteristics are investigated from the theory of the equivalent circuit. Mathematical expressions which estimate accurately the upper and lower cutoff frequency and bandwidth of the band gap for different side lengths of patches are obtained and verified. Studies show that space between patches changes the bandwidth, but has no influence on the characteristics of the left part of the band gap. When the radius of vias is reduced, the band-gap shifts left and becomes narrow. Finally, The time-domain characteristic of the signal transmission line using EBG structure as a return path is also analyzed. Experiments show that the smaller the period of structure, the worse the signal quality.
2013, Vol. 35 
