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A new UH-shaped DGS wideband common-mode filter is proposed. By selecting the appropriate size and resonant point of a single DGS structure, the mutual coupling between each resonator is utilized to achieve a small area (8 mm×8 mm), wide stopband (3.61 GHz 10.7 GHz) and low cutoff frequency. For the differential mode signals, the stopband attenuation was less than -1.5 dB which maintained good signal integrity. At the same time, a new design method was proposed to reduce the area of the wideband DGS structure filter. By changing the shape of the graph, the "U" groove was replaced by a "C" groove, which reduced the DGS structure by 10 %, while the stopband range increased by 1.34 GHz.