Patent ID: 8248307

Claim:
An high-impedance-surface-featured electromagnetic band-gap structure, comprising: a circuit board having a first surface and a second surface opposite the first surface; a ground plane disposed on the first surface; and a plurality of electromagnetic band-gap units sequentially disposed on the circuit board along an edge of the ground plane as a 1-dimensional structure, and every electromagnetic band-gap unit comprises: a first strip line located on the first surface of the circuit board and having a first line and a second line, wherein an end of the first line is connected to the second line to form a “L” shape appearance and the other end of the first line is connected to the ground plane; a second strip line located on the second surface of the circuit board, wherein a portion of the second strip line overlaps a second line of a neighboring electromagnetic band-gap unit; and a via formed in a position of the first line connected to the second line and passing through the circuit board, wherein the second strip line is connected to a first strip line of a neighboring electromagnetic band-gap unit through the via.