Per-Unit-Length Inductance Matrix Computations Using Modified Partial Inductances

We summarize the definition and the known properties of the modified partial inductances of parallel conductors. We show how modified partial inductances can be used to compute the dc perunit- length (p.u.l.) inductance matrix of a multiconductor stripline interconnection. We then provide accurate asymptotic expansions for the dc p.u.l. inductance matrix of multiconductor microstrip or stripline structures, as the ground plane's breadth becomes large.