厚介质防护层下天线方向图恶化机理分析及解决办法

定性的讨论了厚介质防护层下天线方向图的恶化机理,并结合电磁软表面提出了改善天线辐射性能的方法。将厚介质防护层等效为多层不同数值的阻抗层。通过分析电磁波和表面波的传播路径,解释了厚介质防护层下天线方向图恶化的原因。通过增加电磁软表面,扼制了表面波的传播及其引起的辐射,降低了厚介质防护层对天线方向图的影响。方向图测试结果显示,利用电磁软表面抑制表面波的传播,可以有效改善厚介质防护层下天线的方向图,在高超音速飞行器通信领域具有一定的应用前景。

Analysis and Solution for the Deterioration of the Antenna Pattern under Thick Dielectric Protection Layer

In this paper, the reason and solution of the deterioration of the antenna pattern under thick dielectric protection layer are discussed. The thick dielectric protection is equivalent to a multilayer impedance layer with different values. By analyzing the propagation path of electromagnetic wave and surface wave, the reason of deterioration of antenna pattern under thick dielectric protection layer is explained. The propagation of the surface wave and the radiation caused by surface wave are restrained by increasing the electromagnetic soft surface, and the influence of the thick dielectric protection layer is reduced. The experimental results show that the electromagnetic soft surface can effectively improve the radiation characteristics of the antenna under thick dielectric protection layer. This design method has a certain application prospect in the field of hypersonic vehicle communication system.