ID 原文 译文
13894 天线电流分布选用泰勒分布, 利用HFSS软件确定缝隙倾角初值, 在此基础上得到波动分布的倾斜角度, 并通过遗传算法对缝隙倾角进行优化.使用Matlab与HFSS软件联合仿真, 省略了建模、设置参数等大量操作, 提高了设计效率。 The Taylor distribution is used as the current distribution of the antenna, the initial inclined angles are obtained by the HFSS, based on which the wave distribution of inclined angles is proposed, and the inclined angles are optimized by genetic algorithm. The co-simulation of Matlab and HFSS is adopted, which omits a large number of operations of creating models and setting up parameters, thus the efficiency of designing is clearly improved.
13895 基于此, 设计了一款长度为1.2m的X波段波导窄边裂缝天线, 仿真发现副瓣电平比传统设计方法低2.17dB, 加工了天线实物并进行了测试, 天线实测增益和副瓣电平分别为20.9dBi和-28.7dB, 验证了方法的有效性。 With the method, a 1.2 meters long waveguide narrow wall slot antenna operating at X band is designed. The simulated result indicates that the sidelobe level is 2.17 dB lower than that obtained by the traditional design method. Finally, the antenna is manufactured and tested, and the tested gain and sidelobe level of the antenna are 20.9 dBi and-28.7 dB respectively, and the effectiveness of which is verified.
13896 采用FEKO软件仿真带罩天线远场方向图和近场场图, 采用近场场图分析远场方向图近副瓣畸变的原因。 Near-field and far-field pattern of radome enclosed antenna are simulated by FEKO, and the reason of far-field pattern proximal lobe distortion is analyzed based on near-field pattern.
13897 仿真过程中采用等效源技术, 兼顾仿真精度和仿真效率。 Equivalent nearfield technique is applied in simulation process, which is precise and effective.
13898 带罩天线方向图近副瓣畸变主要是由天线罩尖部区造成的, 近场场图表明三种效应导致近副瓣抬升：其一, 电磁波经过天线罩尖部发生明显的衍射, 波阵面分叉； Near-field pattern indicates three effect result in proximal lobe lifting:firstly, radome top area diffracts electromagnetic wave obviously, and wavefront bifurcates;
13899 其二, 金属雨蚀头被激励出表面电流, 进而产生二次辐射； secondly, metalic nose tip is excitated to engender surface current which causes secondary radiation;
13900 其三, 部分电磁波能量经反射后透过天线罩尖部区域, 反射-透射电磁波能量叠加在副瓣方向上。 thirdly, partial electromagnetic wave reflects and then transmits through radome top area, thus reflection-transmission wave energy superposes in proximal lobe direction.
13901 针对上述效应, 对天线罩改进设计, 改进后可明显抑制带罩天线近副瓣的抬升。 Radome design is improved based on three effects mentioned above, and proximal lobe level of radome enclosed antenna is degraded obviously.
13902 近场场图分析方法揭示了天线罩局部细节和远场方向图之间的联系, 对天线罩电性能优化设计有很好的指导作用。 Near-field pattern method reveals the relationship between radome local details and far field pattern, and is very valuable in radome electronic performance optimization.
13903 对高速信号通过电源板时的电源完整性 (power integrity, PI) 问题进行研究时, 因为电源板中主要模式分布为零阶平行板模式, 可以采用二维简化以提高效率，而对于隔离盘或其它存在纵向不连续性的区域, 则应采用三维算法以保证精度。 Power integrity (PI) problem is essential when analyzing high speed signal passing through power ground. The fundamental mode in power ground is the zero-order parallel plate mode, which is capable for 2D simplification.However, in areas around anti-pads and other z-axis discontinuities, 3D algorithm has to be adopted to improve the accuracy.