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A Novel Fractal Defected Ground Structure for Microstrip Line
H.W. Liu, Z.F. Li and X.W. Sun

A novel fractal defected ground structure (DGS) for microstrip line is proposed. The DGS unit cell is composed of a Sierpinski carpet. The proposed fractal DGS can provide more excellent bandgap characteristics and transmission characteristics than the conventional dumbbell- shaped DGS. The bandgap characteristics of the fractal DGS are explained by an equivalent circuit using a circuit analysis method. Comparison between simulation and measurement confirm the validity of the proposed fractal DGS.

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