Abstract
This chapter reviews the role of common mode (CM) filters in high‐density printed circuit board (PCB) designs and the previously analyzed beneficial properties of the electromagnetic bandgap (EBG) structures. It introduces the concept of a CM filter based on patch resonant cavities and the operating principle underlying the construction of EBG‐based CM filters. The main goal of the chapter is to introduce the design approach that has to be used in the building of EBG‐based CM filters, and in particular the attention is focused on the so‐called onboard filters. The chapter describes different design strategies and states proper considerations in order to target the EBG filter to specific design purposes, such as the improvement of the filter attenuation and bandwidth, or to minimize the occupied surface. Finally, it describes the main advantages and disadvantages of the considered structures so that the optimum design solution can be implemented.
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