Selectively Embedded Electromagnetic Bandgap Structure for Suppression of Simultaneous Switching Noise

A selectively embedded method for enhancing the suppression against simultaneous switching noise is proposed based on coplanar electromagnetic bandgap (EBG) power plane. According to this method, a novel EBG structure is designed on the basis of periodic L-bridge, and meanwhile, a ML-bridge cell is inserted into each L-bridge unit where a power port is located. It is shown that the structure achieves an ultrawide bandgap extending from 490 MHz to 16 GHz at suppression depth of -30 dB by both simulation and measurement. In addition, the lower and upper cutoff frequencies are estimated by the use of equivalent circuit models and parallel-plate waveguide theory, respectively. In the end, the IR-drop characteristics over the structure are investigated.