| 摘要: |
| 利用有源单元方向图法，提出分别采用小型直线阵和小型三角形栅格阵列外推计算大型三角形栅格阵列天线时域辐射场的两种等效方法，在考虑单元间互耦的同时极大地节约了计算时间。由于两种方法采用的小阵规模和布局不同，导致其计算精度和效率存在较大差异：第一种方法具有较高的计算效率，其计算时间不到仿真软件的4%，但第二种方法计算精度更高，其计算结果与有限积分法软件的仿真结果吻合良好，最大相对误差小于6%，计算时间不到仿真软件的11%。进一步结合第二种方法和田口算法对85元阵列的能量方向图进行优化，在波束宽度的制约条件下获得了较低的副瓣电平，优化时间不到半小时，验证了方法的高效性。 |
| 关键词: 脉冲阵列天线 三角形栅格 时域方向图 低副瓣优化 |
| DOI： |
|
| 基金项目:高功率微波技术重点实验室自主基础研究项目(2014H01022) |
|
| Fast calculation and optimization for triangle-grid array antenna |
| CHEN Haiyan,XIONG Xiangzheng,CHEN Kaiya,LIAO Cheng |
| () |
| Abstract: |
| According to the active element pattern theory,this paper proposes two methods for fast calculating the time-domain radiation patterns of large arrays. With the methods,time-domain analysis problems of a large triangle-grid array are respectively converted into problems of a small linear array and a triangle-grid one. Meanwhile,the mutual coupling is considered and the computational cost is reduced greatly. The different size and layout of the small arrays in two methods leads to a great difference in precision and efficiency. Results show that the first method obtains a higher efficiency and the time cost is less than 4% of that simulated by the finite integral method. However,the second method achieves a better precision,whose results agree well with the simulation results and the maximum relative error is less than 6%,and computation time is less than 11% of the simulation time. Furthermore,combined with the second method,Taguchi algorithm is adopted for 85-element array energy patterns optimization,and the side lobe level is reduced while the beam width is limited. What’s more,the optimization time is less than half an hour,which verifies the validity of the method. |
| Key words: pulse array antenna triangle-grid time-domain radiation pattern low side lobe optimization |
