From Fig. 1, the complexity of the package structure with an embedded EAC is quite obvious. First, the cut-out in the HDI substrate provides an easy path for core moisture to escape, giving rise to a chimney like region that can be susceptible to “popcorning” if the BU copper is not designed properly [5]. Secondly, introduction of a large ceramic body into the substrate core gives rise to several dissimilar materials in close proximity to each other. Dissimilar CTE values of the