FFT (Fast Fourier’s Transform) is performed on this function and antenna response in time domain is obtained using IFFT (Inverse Fast Fourier’s Transform) to the results of program SPAN in frequency domain. Results for electric field and for potential, as the consequences of induced currents, are presented in the paper in the form of graphics.
Keywords - Pulse electromagnetic field, receiving antenna, lightning discharge.
I. INTRODUCTION
Pulse response of a wire antenna structure, consisting of lineic cylindrical segments, is obtained using programs SPAN and FAS[4], Integral equation of Hallen’s type is used for determining currents along conductive segments and for obtaining receiving antenna response for each frequency of incident field. Currents are approximated by polynomials with complex coefficients. Collocation Method i.e. Point Matching Method is used for approximate numerical solving of the equations system. In the case of pulse field of lightning dis¬charge current, one simple approximation of pulse function representing external electric field is chosen. FFT is per¬formed on this function, program SPAN is used in frequency domain and, afterwards, IFFT is used for obtaining results in time domain. The results for electric field in some points in¬side a chosen wire structure are presented in the paper.
n. CALCULATION OF ELECTROMAGNETIC FIELD OF
RECEIVING ANTENNA STRUCTURE
For an arbitrary conductive configuration in external electromagnetic field of a plane wave of arbitrary frequency, on condition that all parts can be treated as thin cylindrical lineic segments with equivalent radii, following equation system is obtained, for determining complex constants and coefficients in the polynomial approximations of the cur- rents along conductive segments:
FFT (Fast Fourier’s Transform) is performed on this function and antenna response in time domain is obtained using IFFT (Inverse Fast Fourier’s Transform) to the results of program SPAN in frequency domain. Results for electric field and for potential, as the consequences of induced currents, are presented in the paper in the form of graphics.Keywords - Pulse electromagnetic field, receiving antenna, lightning discharge.I. INTRODUCTIONPulse response of a wire antenna structure, consisting of lineic cylindrical segments, is obtained using programs SPAN and FAS[4], Integral equation of Hallen’s type is used for determining currents along conductive segments and for obtaining receiving antenna response for each frequency of incident field. Currents are approximated by polynomials with complex coefficients. Collocation Method i.e. Point Matching Method is used for approximate numerical solving of the equations system. In the case of pulse field of lightning dis¬charge current, one simple approximation of pulse function representing external electric field is chosen. FFT is per¬formed on this function, program SPAN is used in frequency domain and, afterwards, IFFT is used for obtaining results in time domain. The results for electric field in some points in¬side a chosen wire structure are presented in the paper.n. CALCULATION OF ELECTROMAGNETIC FIELD OFRECEIVING ANTENNA STRUCTUREFor an arbitrary conductive configuration in external electromagnetic field of a plane wave of arbitrary frequency, on condition that all parts can be treated as thin cylindrical lineic segments with equivalent radii, following equation system is obtained, for determining complex constants and coefficients in the polynomial approximations of the cur- rents along conductive segments:
การแปล กรุณารอสักครู่..