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A Broadband Common Mode Filter With Embedded Ring Structure

A broadband common mode filter embedded in the multi-layer printed circuit board is proposed in this paper. The filter is composed of four metal layers, and the ring structure with the serpentine transmission line connected on the third metal layer from the top to bottom layer is designed for creating transmission zeros at separate frequencies. This property is utilized to accomplish broadband suppression of common mode noise with a compact filter design. HFSS is used to verify the filter design and the simulation result shows the common mode noise can be suppressed over 10 dB from 1.57 to 7.87 GHz with 133 percent fractional bandwidth. With this excellent performance of noise suppression, the differential mode insertion loss of the proposed common mode filter can still be smaller than 2 dB below 10 GHz.