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Extrapolation of Electromagnetic Response from Linear Antennas in Time Domain without Late-Time Instabilities in Numerical Solution of EFI Equation

Witenberg Anna

Journal of Telecommunications and Information Technology

2020

nr 2

45--50

The paper presents a new hybrid method relied upon to solve integral equations of the electric ﬁeld in time domain and to model linear antennas with pulse excitation. The method consists in a mixed, numerical-analytical description of the process that helps maintain the stability of calculations during the late time phase. As described in the analytical part, the modiﬁed spherical Bessel function of the ﬁrst kind allows for extrapolation with a high degree of accuracy and loworder expressions. The modiﬁed spherical Bessel functions of the ﬁrst kind are of the oscillating character, and their combination with the exponential factor makes them convenient for extrapolation of the answer of the antenna with pulse excitation. New functions are introduced to computational practice.