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==Theory==
The classical PEEC method is derived from the equation for the total electric field at a point<ref>S. Ramo, J. R. Whinnery and T. Van Duzer: Fields and Waves in Communication Electronics, John Wiley and Sons, 1972</ref> written as
<ref>A. E. Ruehli: Equivalent Circuit Models for Three-Dimensional Multiconductor Systems, IEEE Transactions on Microwave Theory and Techniques, Vol. 22 (1974), Nr. 3</ref>
===PEEC model reduction===
The rigorous full-wave version of the PEEC method is called (Lp,P,R,t) PEEC, where Lp is partial inductance, P is potential coefficient (inverse of capacitance), R is resistance, and t is delay. If available, reduced model of the full-wave version can be used. For example, if the EIP structure is electrically small, the delay term t can be omitted and the model can be reduced to (Lp,P,R) PEEC model. In addition, if frequency is sufficiently high so that w*Lp >> R, we can omit R term and use approximate (Lp,P) PEEC model. According to various modeling situations, (Lp) and (Lp,R) models are also useful.
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