| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic bandgap structure which can have a low bandgap frequency while having a small size and solve the problem of a mixed signal between an analog circuit and a digital circuit, and to provide a printed circuit board. SOLUTION: This electromagnetic bandgap structure includes a metal layer and a plurality of mushroom type structures each having a metal plate and a via, wherein the plurality of mushroom type structures form a stack structure on the metal layer. COPYRIGHT: (C)2009,JPO&INPIT |
