Patent ID: 7839654

Claim:
A noise isolation system comprising a plurality of electromagnetic bandgap structures, comprising: a power plane; a dielectric layer disposed on the power plane; an alternating impedance electromagnetic bandgap (AI-EBG) plane disposed on the dielectric layer, the AI-EBG plane comprising a first AI-EBG structure and a second AI-EBG structure; and a power island formed within and electrically isolated from at least one of a plurality of first alternating impedance electromagnetic bandgap patterns of the first AI-EBG structure by a gap that substantially surrounds the power island; wherein the plurality of first alternating impedance electromagnetic bandgap (AI-EBG) patterns of the first AI-EBG structure are disposed on the dielectric layer and the first AI-EBG patterns together with a portion of the power plane and a portion of the dielectric layer forms the first AI-EBG structure (type I), wherein each of the plurality of first alternating impedance bandgap structures comprises a metal patch having a first characteristic impedance and a plurality of branches connected to the metal patch and each of the branches has a second characteristic impedance, wherein the second characteristic impedance is relatively high with respect to the first characteristic impedance; and wherein a second plurality of second alternating impedance electromagnetic bandgap patterns (AI-EBG) are disposed on the dielectric layer and the second AI-EBG patterns together with a corresponding second portion of the power plane and a corresponding second portion of the dielectric layer forms the second AI-EBG structure (type II), wherein each of the plurality of second alternating impedance electromagnetic bandgap structures comprises a second metal patch having a third characteristic impedance and a plurality of second branches connected to the second metal patch with the second branches having a fourth characteristic impedance, wherein the fourth characteristic impedance is relatively high with respect to the third characteristic impedance.