Glass-weave periodic loading can introduce additional insertion loss at midrange frequencies. This article characterizes these additional losses using actual glass weave cross-sectional data. It also shows how trace route angle and length can set up different secondary resonance patterns.
VNA measurements showed that the board-to-board skew distribution of realistic board topologies/routes can be broad, and the peak measured skew was quite significant. Post processing of TDR data suggested that long routes parallel to the board edge may be particularly susceptible to skew variation due to the glass weave.