Mutual immittance calculation program, mutual immittance calculation apparatus and method, and electromagnetic-field strength calculation program

A mutual immittance calculation apparatus comprising:

• a processor executing instructions to performing as
• an input unit that inputs data of a model of an electric circuit apparatus, being a target for analysis of the electromagnetic-field strength and being divided into a plurality of patches having points at corners and edges connecting pairs of points;
• a discrimination unit that discriminates a main portion from an additional portion in the patches;
• a mode setting unit that sets a mode, where the mode corresponds to a linear dimension of the electric circuit apparatus, for the main portion and the additional portion;
• a mutual immittance calculation unit that calculates the mutual immittance for combinations of patches corresponding to the main portion and calculating the mutual immittance for combinations of patches corresponding to the additional portion using the table;
• and
• a storage unit that stores a result of calculating the mutual immittance corresponding to the main portion and a table representing the correspondence between the edges, points and patches, wherein the mutual immittance calculation unit uses the calculation result stored at the storage unit when the model in which only the additional portion has been changed is calculated for a second time onward, and recalculates the mutual immittance corresponding to the changed additional portion.

A mutual immittance calculation method comprising:

• inputting data of a model of an electric circuit apparatus, being a target for analysis of the electromagnetic-field strength and being divided into a plurality of patches having points at corners and edges connecting pairs of points;
• discriminating a main portion from an additional portion in the patches;
• creating a table representing the correspondence between the edges, points and patches;
• setting a mode, where the mode corresponds to a linear dimension of the electric circuit apparatus, for the main portion and the additional portion;
• calculating the mutual immittance for combinations of patches corresponding to the main portion and calculating the mutual immittance for combinations of patches corresponding to the additional portion using the table;
• and
• storing a result of calculating the mutual immittance corresponding to the main portion, wherein the mutual immittance calculating step includes using the calculation result stored at the storing step when the model in which only the additional portion has been changed is calculated for a second time onward, and recalculating the mutual immittance corresponding to the changed additional portion.

A computer-readable medium that stores therein a computer program that causes a computer to execute an electromagnetic-field strength calculation comprising:

• inputting data of a model of an electric circuit apparatus, being a target for analysis of the electromagnetic-field strength and being divided into a plurality of patches having points at corners and edges connecting pairs of points;
• discriminating a main portion from an additional portion in the patches;
• creating a table representing the correspondence between the edges, points and patches;
• setting a mode, where the mode corresponds to a linear dimension of the electric circuit apparatus, for the main portion and the additional portion;
• calculating the mutual immittance for combinations of patches corresponding to the main portion and calculating the mutual immittance for combinations of patches corresponding to the additional portion using the table;
• storing a result of calculating the mutual immittance corresponding to the main portion;
• and
• calculating the electromagnetic-field strength, based on the calculation result of the mutual immittance, wherein
• when the mutual immittance calculation is made to the model in which only the additional portion has been changed for a second time onward, the mutual immittance corresponding to the changed additional portion is recalculated using the stored calculation result.