In this paper, scattering of the electromagnetic waves from a metal elliptical cylinder covered by a plasma layer is investigated by the Finite Element-Boundary Integral (FE-BI) method. The under study object that can be supposed as an elliptic complex antenna is located in a constant magnetic field. The inner cylinder can be rotated to plasma cover so that they are nonconfocal. Generally, elliptic antennas have azimuthal asymmetry and their response to electromagnetic waves is sensitive to incident angle of landing wave. This effect is more severe in under study antenna due to its geometrical configuration that depends on the rotating angle of the conducting core related to plasma cover. Furthermore, presence of constant magnetic field along the antenna axis causes permittivity tensor of the plasma as an influential factor in radar cross section, becomes anisotropic. Here, backscattering radar cross section (BRCS) of the antenna is calculated when irradiated by TE and TM waves under different incident angles. It will be shown how one can control BCRS of the antenna by varying its configuration and the external magnetic field intensity. Validation of numerical computations applied in this work is demonstrated by comparing it with an analytical method for a special case.

在本文中，通过有限元边界积分 (FE-BI) 方法研究了来自被等离子体层覆盖的金属椭圆圆柱体的电磁波散射。可以假设为椭圆复合天线的研究对象位于恒定磁场中。内圆柱体可以旋转到等离子体盖上，因此它们是非共焦的。通常，椭圆天线具有方位角不对称性，其对电磁波的响应对着陆波的入射角敏感。由于其几何配置取决于与等离子体覆盖相关的导电芯的旋转角度，因此这种效应在研究中的天线中更为严重。此外，沿天线轴存在恒定磁场会导致等离子体的介电常数张量成为雷达截面的影响因素，变得各向异性。这里，计算了天线在不同入射角下受到 TE 和 TM 波照射时的背向散射雷达截面（BRCS）。将展示如何通过改变天线的配置和外部磁场强度来控制天线的 BCRS。通过将其与特殊情况的分析方法进行比较，证明了在这项工作中应用的数值计算的验证。