薄层等离子体隐身天线罩散射分析  

Analysis of EM Scattering from Stealth Radomes Made of Thin Plasma Slab

作　　者：孟刚[1] 莫锦军[1] 任爱民[1] 

机构地区：[1]北京航天长征飞行器研究所,北京100076

出　　处：《导弹与航天运载技术》2008年第3期33-36,共4页Missiles and Space Vehicles

摘　　要：为降低雷达舱的电磁散射,提出了一种薄层等离子体隐身天线罩模型。利用时域有限差分方法计算了该模型的电磁散射特性,分析了等离子体电子密度和碰撞频率对其隐身效果的影响。经过大量的分析计算发现,薄层等离子体天线罩的隐身机理主要有两个方面:当入射波频率小于等离子体特征频率时,等离子体对入射波是截止的,因为罩体是低散射外形而实现隐身;当入射波频率大于等离子体特征频率时,部分电磁波能进入天线罩,但因等离子体对入射波的吸收而衰减。To reduce the electromagnetic scattering from the complex structures inside radomes, a stealth radome model made by thin plasma slab is presented. With the time domain finite difference method （FDTD）, the electromagnetic scattering characteristics of the stealth radomes are calculated, and the relationships between the stealth effect and the plasma parameters （including electric density and collision frequency） are discussed. Basing on the mass numerical results, the following two reasons make the plasma radome stealthy are outlined： when the wave frequency lower than the plasma frequency, the wave can＇t propagate in plasma, the reflected energy is low because of the low scattering shape of the radome; when the wave frequency is greater than the plasma frequency, the wave can partly propagate into the radome, but most of its energy is absorbed by the plasma.

关 键 词：等离子体 隐身天线罩 雷达散射截面 时域有限差分法 

分 类 号：TN95[电子电信—信号与信息处理]