On the Simulation Analysis for a Wideband Common-mode Filter with Defected Corrugated Reference Plane Structure

A new scheme of a wideband common-mode filter for defected corrugated reference plane structure (DCRP), which is embedded in a multilayer printed circuit board. It utilized the common-mode current return path principle, stepped-impedance characteristics, and defected ground structure (DGS), to generate a specific rejection band, many close transmission zeros generate in the common-mode (CM), the common-mode noise causes the stopband effect. The design analysis and simulation results by HFSS indicate that the common-mode noise suppressed over 10dB from 3.76 GHz to 16.09 GHz with 124 percent of fractional band-width, the insertion loss of differential-mode (DM) remained less than -2.2 dB from DC to 20 GHz. The DCRP filter is a low-cost design, which applicable wideband suppression of common-mode noise for differential pair signals up to 16 GHz frequency.