Characterization of via-induced parallel-plate resonances in a printed circuit board

Abstract

This paper describes the fundamental characteristics of parallel-plate resonances which are induced by the via penetrating a parallel-plate in a multilayer printed circuit board (PCB). From the results of experiments and simulations, the origin of the strong resonance peak in the |S/sub 21/| characteristic is discussed. It is shown that the strong resonance peak may result from the correspondence between the parallel resonance frequencies in the input impedance of the parallel-plate and in that of the signal trace with the exception of the via.