机载宽频带雷达罩双向变厚度设计方法

摘要

新一代战机的火控雷达向着宽频带和相控阵方向发展。针对宽频带相控阵机头雷达罩的高性能要求，提出了“高传输、低反射、等插入相位延迟”综合设计准则。分析了宽频带夹层罩壁结构的电性能特性，针对其相位特性差的情况给出了一种新的双向变厚度设计方法。通过雷达罩轴向变厚度设计以适配不同的入射角获得高传输/低反射性能，通过环向变厚度设计以适配不同的极化角获得接近的插入相位延迟，实现了优良的宽频带传输性能和方向图特性，在雷达罩产品研制中得到应用并发挥了重要作用。%The direction of the new generation airborne fire control radar development is towards broadband and phased array.To aim at the high performance requirements from broadband phased array on radome,this paper put forward the design rule as “high transmission efficiency,low reflection,and equal insertion phase delay”to conduct the required electrical performance analysis.To overcome the unfavorable phase character-istics of sandwich wall structure,this paper raised a new bi-directionally changing thickness design method that utilizes changing thickness along radome axial direction to mate with different incident angles in an effort to achieve high-transmission/low-reflection performance.In addition,changing thickness along radome circu-lar direction can mate with different polarization angles and achieve equal insertion phase delay.Better broad-band transmission efficiency and radiation pattern can thus be achieved.The method proposed in this paper has been used in radome development programs and achieved the best available results.