Analysis of the Nonconcentric Radome-Enclosed Cylindrical Reflector Antenna System, E-Polarization Case

Abstract

Abstract-Two-dimensional (2-D) radiation of a directive complex line source is analyzed in the presence of a perfectly conducting (PEC) reflector antenna system and nonconcentrically located dielectric radome. Similar problem was studied in the literature by using method of regularization and Green's function formulation for the Hpolarization case. Here the same techniques are used for E-polarization case but in this case the scattered part of the Green's function is computed by using an FFT based algorithm. This provides us to solve the larger geometries accurately in reasonable computer times. So this approach can be considered as another alternative for the analysis of the E-polarized radome-enclosed reflector antenna system. Various numerical results are presented to support the convergence and accuracy of the technique and at the same time these results can be considered as reference data.

Analysis of the Nonconcentric Reflector Antenna-in-radome System by the Iterative Reflector Antenna and Radome Interaction

“…Even though five iteration is used, 3 iteration is enough for visible convergence as it is seen in Figure 6(a). Figure 6(b) shows the variation of the surface current density obtained from the present method and the solution given in [14]. The results are indistinguishable.…”

“…The results are indistinguishable. To highlight the difference, in Figure 6(c), the surface current variation is compared with the similar result obtained in [14] and it is plotted as a relative error in the current i.e., the difference between two solution in the logarithmic scale. Except the near the edges, the relative error between two solution is less than the −20 dB i.e., the two digit accuracy exist.…”

“…By following the similar procedure given in [13,14], the E p z,rad in Equation (7) is directed to the reflector surface as a new incident field. It has to be evaluated on the whole r 1 = a circle to proceed the iteration scheme.…”

“…The nonconcentric one which is widely used in practice especially for the small radome geometries was also analyzed by the combination of the MAR, Green's function and CSP methods in [12]. Then for the same problem the solution was tried to be improved by the usage of the available FFT algorithm in the computation of the Green's function in [13,14]. By this way, larger geometries are simulated in reasonable CPU times.…”

Scattering of Reflector Antenna With Conic Dielectric Radome

“…Thus, the creation of methods for calculation and RCS estimation obtaining of antenna systems with radome is very important for an aerial target detection. The investigation of scattering characteristics for antenna systems with radomes has been a subject of much fruitful study [2][3][4][5][6][7][8][9][10][11][12][13]. Intrasystem interactions springing up in illumination of the "antenna-radome" system lead to more complex calculations.…”