Patent ID: 6871334

Claim:
A method of calculating an equivalent circuit by a computer, with regard to an object that has a conductor, a dielectric to support the conductor, and plural input/output terminals to the outside, does not have sources and sinks of currents inside thereof, and satisfies the linearity and reciprocity to the input/output amounts of currents and voltages, and to the object such that the internal electric characteristics are invariable with time, the method comprising the steps of: receiving inputs of geometry information to specify a shape of a conductor in a circuit board being the object of determining the equivalent circuit, and material information to specify a material of the circuit board; partitioning, on the basis of the geometry information received, the shape of the objective conductor into meshes, and creating and storing mesh data to be expressed; calculating a nodal admittance matrix from the mesh data, and storing the result; calculating a number of nodes and a number of independent networks on the basis of the mesh data, and determining an incidence matrix to decide a connection of a tree structure that radially connects any of reference nodes to the other nodes; determining a structure of an equivalent circuit network by means of the nodal admittance matrix and incidence matrix as calculated above; and determining values of elements of the equivalent circuit network.