EMI mitigation by substrate integrated common mode filter

In this research we propose a novel common mode (CM) EMI filter without discrete components for power electronic converters which is realized on a thin film standard printed circuit (PCB) substrate. The EMI low-pass filter features an integrated shunt capacitor, a defective ground structure (DGS) and provides EMI noise reduction greater than 10dB from 1MHz to 1GHz. We present a filter prototype and demonstrate its performance on a DC/DC buck converter with 650V rated GaN HEMTs which operate with a dv/dt=100V/ns.