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Design of a wideband common-mode filter using approximate closed-loop pattern of compact C-shaped defected ground structure

引用

The Journal of China Universities of Posts and Telecommunications 2017年第3期24卷 70-74页

作者： Yao Yindi Zeng Zhibin School of Communication and Information Xi'an University of Posts and Telecommunications School of Microelectronics Xidian University

A compact common-mode filter is proposed to suppress common-mode noise for application of high-speed differential signal traces. The filter adopts one big C-shaped defected ground structure （DGS） cell in the left of ground plane and two small C-shaped DGS cells with opposite direction in the right of ground plane. Because these DGS cells have different dimensions, the filter has three adjacent equivalent resonant points, which can suppress wideband common-mode noise effectively. The left C-shaped DGS and its adjacent C-shaped DGS cell form an approximate closed structure, which can efficiently reduce the influence of the mutual capacitance. The filter provides a common-mode suppression from 3.6 GHz to 14.4 GHz over 15 dB while it has a small size of 10 minx 10 mm. The fractional bandwidth of the filter is 120%, and the differential signals still keep good signal integrity. The experimental results are in good agreement with the simulated results.

关键词： common-mode filter approximate closed-loop structure defected ground structure insertion loss

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Wideband bandstop defected ground structure filter with enhanced common-mode suppression using split ring

引用

The Journal of China Universities of Posts and Telecommunications 2015年第5期22卷 80-83页

作者： Yao Yindi Zeng Zhibin School of Communication & Information Xi'an University of Posts & Telecommunications School of Microelectronics Xidian University

An effective method to broaden the rejection bandwidth of dump-shaped defected ground structure(DGS) filter design is proposed in the paper. One traditional dumbbell-shaped DGS is split by using one split ring, and reconstructed into two different compact DGSs. The distance between both of the DGSs is so close that there exists mutual inductance, which can be utilized to broaden the rejection bandwidth effectively. The effect of different parameters of the split ring on the rejection bandwidth and depth of the filter is analyzed. Simulated results demonstrate that, with the same area of 5.5mm by 10 mm, rejection bandwidth of the proposed filter is from 4.4 GHz to 10.5 GHz for the common-mode noise(CM) while that of the traditional dumbbell-shaped DGS is from 5.3 GHz to 7.3 GHz. Compared to other schematics adopting multiple DGS to broaden bandwidth, it can broaden the bandwidth by dividing the existed DGS into multiple parts and reconstructing a new filter. The experimental results show good agreement with simulated results.

关键词： defected ground structure common-mode filter diffe

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