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Novel compensation method for electromagnetic performance of dielectric radome based on reflector shaping

机译：基于反射器整形的新型天线罩电磁性能补偿方法

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摘要

From the viewpoint of geometrical optics, dielectric radome degrades the electromagnetic performance of the enclosed antenna by distorting the amplitude distribution and phase distribution of aperture field, of which the latter is mainly responsible for the distortion of far-field pattern. A novel method based on reflector shaping is proposed to compensate the phase distortion of aperture field caused by radome. The aperture field of the shaped reflector antenna possesses a phase distribution, which has an inverse trend when compared with the phase distortion caused by radome, thus making the aperture field become equiphase after transmitting through the radome. Two different antenna-radome systems are simulated and the results show that the proposed method is effective, particularly for compensating the distortion of far-field pattern such as the variation of sidelobe and null depth. Further analysis indicates that the shaping method is applicable to multifrequency-band antenna-radome systems.
机译：从几何光学的观点来看，介电天线罩会通过使孔径场的幅度分布和相位分布失真而降低封闭天线的电磁性能，其中孔径场的相位分布主要是造成远场方向图失真的原因。提出了一种基于反射器整形的新方法来补偿天线罩引起的孔径场的相位畸变。成形反射器天线的孔径场具有相位分布，与由天线罩引起的相位畸变相比具有相反的趋势，因此使得孔径场在穿过天线罩后变为等相。对两种不同的天线-天线罩系统进行了仿真，结果表明所提出的方法是有效的，特别是对于补偿远场方向图的失真（如旁瓣和零位深度的变化）特别有效。进一步的分析表明，该整形方法适用于多频带天线-天线罩系统。

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