Electromagnetic band gap material: Exotic stuff for not-so-exotic EMI/EMC applications

摘要

Using EBG structures can result in a dramatic reduction in switching noise. AS DIGITAL CIRCUITS BECOME FASTER and more powerful, direct radiation from printed circuit boards (PCBs) and switching noise become more of a concern for EMI/EMC and signal integrity engineers than ever before. Also, as the frequency increases and the wavelength shrinks, structures that had been electromagnetically quiet are now producing significant radiation. Short of a completely unacceptable reversion to slower microprocessors, what can be done to reverse the trend toward ever-increasing radiation and ever more restrictive radiation standards? Certainly, engineers can try the same old tricks relied upon for many years, but many will agree that the effectiveness of "voodoo" and "black magic" may well have reached its theoretical limit.