How should electromagnetic waves below 30MHz be handled?

Abstract

In high-speed products, the physical and mechanical design can affect both Electromagnetic Compatibility (EMC) and Signal Integrity (SI). With board-level clock frequencies in the above 100MHz to 500MHz range, the first few harmonics are within the common communications bands of TV, FM radio, cell phone, and PCS. This means there is the very real possibility of electronic products interfering with communications unless their electromagnetic emissions are kept below acceptable levels. Therefore, EMC issues over 100MHz are of particularly high interest to the experts. However, what is the below 30MHz? This paper describes the analysis of characteristics of digital camera products below 30MHz using EMC simulations.