Introduction VNA PCB. Vector network analyzer is a device used to measure scattering parameters of electrical circuits operating at high frequencies. S-parameters tell how much a circuit reflects power back to the source and how much it attenuates or amplifies it to the other ports. Working with S-parameters is an essential part of designing any electronics operating at GHz frequencies. These devices aren't cheap, especially as the operating frequency increases. High end VNAs that operate at mil...