TD-IE를 이용한 도선 안테나의 과도해석

rransient An alysis of Conducting ^Wire Antennas using T D —lE

In this paper, a new form ulation is presented for analyzing the transient electrom agnetic response from conducting w ire antennas using the tim e-dom ain integral equation (T D -IE ). Instead of the conventional m arching-on in tim e (M O T ) technique, the solution m ethod is based on the G alerk ins m ethod th at involves separate spatial and tem poral testing procedures. Piecew ise triangle basis functions have been used for spatial expansion and testing functions for arbitrarily shaped w ire structures. T he tim e-dom ain variation is approxim ated by a set of orthonorm al basis functions th at is derived from the Laguerre polynom ials. These basis functions are also used for tem poral testing. The m ethod presented in this paper results in very stable transient responses from w ire antennas. Representative num erical results are presented and com pared w ith the inverse discrete Fourier transform (ID F T ) of the frequency dom ain solution.