New approach to EMC protection

Abstract

This paper presents new approach to EMC protection at the expense of proper use of inherent properties of coupled interconnects. The approach is based on new concept of modal filtering used jointly with known filtering principles. Some preliminary results of the approach implementation are presented. Particularly, the difference of per unit length modal delays for various types of cables and PCB interconnects is calculated. It is shown that the difference can be around 1 ns/m, while for special structures can be increased up to 5 ns/m. It allows, for example, for 1 m interconnects the modal filtration against ultra wideband pulses shorter than 1 ns and 5 ns.