Impact of Physical Dimensions and Dielectric Materials in Fuzz Button Interconnection Area on Signal Transmission

Fuzz buttons connectors are widely used in printed circuit board (PCB) vertical interconnection. They provide both mechanical support and electrical connection for the circuits. In order to reduce electromagnetic wave reflection at fuzz button connector transitions resulting from impedance discontinuity, suitable physical dimensions and dielectric material in interconnections area are needed. In this work, a Finite Integration Time Domain (FITD) model for the research objective composed of waveguide PCBs and fuzz-button connectors was developed, and its corresponding SPICE model and Finite Element Analysis (FEA) model were also presented. The FITD model results were consistent with the SPICE and FEA model results. Using the obtained FITD model, the influences of the change of physical sizes and material parameters of fuzz-button connector on circuit impedance were analyzed based on time domain reflectometry (TDR) and high frequency parameters. This research provides a better understanding of the effects of physical dimensions and dielectric materials of fuzz-button connector on signal transmission and guides engineers in the selection of the proper parameters to ensure interconnections with high signal integrity.