What is often cited as the most difficult frequency range to suppress noise at the printed circuit board (PCB) level?
PCB engineers often cite the frequency range of 100 MHz to 2 GHz as the most difficult frequency range to suppress noise. Many waveforms used in digital systems have fundamental and harmonic frequencies that fall in this range. • Q: What technology does WEMTEC offer to address the 100 MHz to 2 GHz frequency range? A: WEMTEC has developed hybrid EBG structures which are a combination of resonant via arrays and inductive grids. Many embodiments of hybrid EBG structures are possible including designs with chip capacitor resonant vias in each unit cell. Such designs offer stopband ratios of 30:1 or greater that cover the 100 MHz to 2 GHz frequency range. • Q: Are all EGB structures inherently narrowband in operating frequency? A: No, this is a common myth. WEMTEC has developed numerous EBG structures for parallel-plate mode suppression which are inherently wideband. For instance, resonant via arrays typically have between one to three octaves of stopband bandwidth. WEMTEC has developed hyb
