When your dealing with high frequency circuits, signal loss is the enemy. Every decibel of attenuation matters, especially when you're pushing signals through the gigahertz range. Traditional PCB fabrication methods just ain't gonna cut it anymore ...

Every signal on a PCB is accompanied by an electromagnetic field. At low frequencies and slow edge rates, those fields are a rounding error — they exist, technically, but they do not cause problems that show up on oscilloscopes or bit error rate te...