【摘要】 依据天线罩对宽频带透波性能的要求,采用传输线理论,建立了单层结构天线罩平板材料透波率的计算方法。对单层结构天线罩材料的介电性能参数进行了优化设计,确定了在2~18 GHz频带,0~40°入射角范围内满足透波率要求的最优介电性能参数。设计结果表明,当材料的介电常数ε≤3.0,损耗角正切tanδ≤0.02时,具有最佳厚度的材料在2~18 GHz频带,0~40°入射角范围内透波率大于60%。根据优化设计结果,兼顾天线罩材料的力学和热学性能等要求,确定了单层结构天线罩材料体系为空心石英纤维增强氮化物陶瓷基复合材料。根据所选材料体系的介电性能(ε=2.8,tanδ=0.005),进一步对其结构参数(厚度)进行了优化计算,确定了满足宽频带透波性能要求的最佳厚度为7mm。对满足壁厚设计要求的单层结构天线罩平板材料进行了宽频带透波性能测试。结果表明,该单层平板材料在2~18 GHz频带范围内透波率大于60%。更多还原

【Abstract】 Based on the requirement of broadband radome,by using the transmission line theory,the calculation method of transmission efficiency of single-layer structure was conducted when the frequency varied from 2GHz to 18GHz and the incidence angle changed from 0 to 40°,the dielectric properties were optimally designed.The results suggest that when the dielectric constant is no more than 3.0 and the loss angle tangent value is no more than 0.02,the transmission efficiency of single-layer structure material with the suitable wall thickness is more than 60%.According to the design results,considering the mechanical and thermal properties,the hollow silica fiber reinforced BN-Si3N4 matrix composites(SiO2f/BN-Si3N4 composites) are selected as single-layer structure radome material.According to the dielectric properties of the composites(ε=2.8,tanδ=0.005),the structural parameter(thickness) was optimally designed,and the optimal wall thickness was 7mm.The broadband properties of SiO2f/BN-Si3N4 single-layer structure radome material in agreement with the wall thickness requirement were tested.The results suggest that the transmission efficiency for single-layer structure radome material is more than 60% when the frequency is 2～18 GHz.更多还原