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When methods employing auxiliary sources are applied to problems involving scatterers that are circular, it has been shown that convergent and correct fields are obtained by divergent and oscillatory amplitudes (currents) of the sources. In this work, we present some preliminary numerical results, which show that the above conclusions remain valid for non-circular scattering cases.
The use of magnetodielectric reconfigurable antennas on smartphones was investigated aiming to meet the requirements of the lower bands of current 4G standards and beyond. Since physical dimensions are constrained by the size of the mobile terminal, a reconfigurability mechanism based on partial magnetodielectric substrates and superstrates was studied in order to shift the resonance frequency lower...
Computational methods, utilizing representations of the approximate solution of a boundary value problem as a finite superposition of fields of fictitious sources located outside the problem's domain, are widely used in the numerical modeling of wave scattering and radiation problems. In this work, we investigate certain convergence issues related to the field solutions derived by the application...
Previous works have discussed in detail the difficulties occurring when one applies numerical methods to Hallén's and Pocklington's integral equations for the current distribution along a linear antenna. When the so-called approximate kernel is used, the main difficulty is the appearance of unphysical oscillations near the driving point and/or near the ends of the antenna. Another work has proposed...
The auxiliary surface current, determined by applying the Method of Auxiliary Sources (MAS) to scattering problems by perfect conductors, may exhibit a certain form of oscillations, which are inherent to MAS and are independent of the word-length and the numerical-integration routines. The purpose of the present work is to demonstrate analytically that the “extended integral equation” (which is similar...
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