Patent ID: 8570114

Claim:
A defected ground structure with a shielding effect, comprising: a dielectric layer, having a first surface and a second surface opposite to the first surface; a defected metal layer, disposed in the dielectric layer and located between the first surface and the second surface, and having a line-shaped opening, wherein the defected metal layer does not connect the grounded metal layer; a grounded metal layer, disposed on the second surface; and at least one conductive mushroom-like structure, disposed between the defected metal layer and the grounded metal layer, arranged along an extending direction of the line-shaped opening periodically, and the conductive mushroom-like structure comprising: a laterally extending member, parallel to the defected metal layer, and a distance being maintained between the laterally extending member and the defected metal layer, wherein a projection area of the laterally extending member on the defected metal layer covers a portion of the line-shaped opening corresponding to the projection area of the laterally extending member; and a vertically extending member, connecting the laterally extending member and the grounded metal layer.