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The moment method based on the concepts of linear space can be used not only for numericalcomputations of electromagnetic field,but also for the analytic solutions.By taking eigenfunction asbasis functions and test functions,a very simple and universal formula suitable to differentboundary conditions can be got.This formula can be used both for scalar wave equations and vectorwave equations by some modifications.
The moment method based on the concepts of linear space can be used not only for numerical computations of electromagnetic fields, but also for the analytic solutions. By taking eigenfunction asbasis functions and test functions, a very simple and universal formula suitable to differentboundary conditions can be got .This formula can be used both for scalar wave equations and vectorwave equations by some modifications.