一种新型的紧凑型DGS共模抑制滤波器设计

Design of A New Compact DGS Common-Mode Rejection Filter

摘要:

提出一种新的UH形DGS宽带共模滤波器,通过选择单个DGS结构合适尺寸和谐振点,利用每个谐振器间的相互耦合,达到了面积小(8 mm×8 mm),宽阻带(3.61～10.7 GHz)和低下限截止频率的效果;对于差模信号,阻带内衰减小于-1.5 dB,保持了良好的信号完整性；同时采用一种新的减小宽带DGS结构滤波器面积的设计方法,通过改变图形的形状,用“C”形槽代替“U”形槽,使该DGS结构相比原有模型减小了10%,同时阻带范围增加了1.34 GHz。

Abstract:

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.