A Polynomial Interpolation Method of MoM Matrices for Analyzing Multilayer Structure in Frequency Sweeping

A polynomial interpolation method is presented for accelerating impedance MoM matrix filling in frequency sweeping from multilayer structure. In this method, frequency samples are expressed into analytical forms in terms of roots of Chebyshev polynomial, for enhancing the interpolation accuracy. The interpolated matrix element is a product of the normalized frequency and the remaining part after factoring out the dominant phase term from the original matrix element so that its frequency behavior can be captured by polynomial.Numerical examples show the accurate solutions over frequency band