A full-order equivalent circuit approach for transmission lines in printed circuit boards

We propose a unique derivation of an accurate and efficient equivalent circuit model for simulating transmission line structures with layer-wise homogenous/inhomogeneous substrates. The derivation is based on mode constraints that arise naturally from mode assumptions. The resulting equivalent circuit representation reflects the fact that the decomposed modes are coupled. To further improve the accuracy of the equivalent circuit approach, a full order representation of the equivalent circuit is proposed.