| 摘要: |
| 为拓宽星载赋形反射面天线的工作带宽，运用物理光学(PO)、物理绕射理论(PTD)和
极小极大值算法(Minimax)对其进行了设计。首先利用PO与PTD相结合的方法来计算天线远场
，然后应用Minimax算法对目标函数进行优化来实现宽频带内的波束赋形。优化过程中同时
考虑了天线的增益和带宽，并采用归一化的电场来进行构建目标函数，以消除评估站点设计
增益对优化过程的影响，获得更好的优化结果。最后以一个服务区为美国国土、工作在Ku频
段的双频双极化单偏置抛物反射面天线为例进行了仿真计算。数值仿真结果表明：当天线
波束与服务区形状匹配并且增益满足设计要求时，其上、下行带宽都达到了1 000 MHz
，具有良好的宽带性能。 |
| 关键词: 星载天线 反射面天线 赋形波束 双频双极化 优化设计 |
| DOI： |
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| 基金项目: |
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| Optimal Design of Broadband Dual frequency and Dual polarized Shaped Reflector Antennas on Satellite |
| ZHANG Xin-gang,WU Gang,ZHONG Ying |
| (China Academy of Space Technology (Xi′an)，Xi′an 710100，China) |
| Abstract: |
| To broaden the bandwidth of shaped reflector antennas on satellite, th
e optimal design of this kind of antennas is addressed, which is based on Physic
al Optics(PO), Physical Theory of Diffraction (PTD) and Minimax method. In the
optimization process, a method combining PO and PTD is firstly used to calculate
the far field and then the broadband contoured beam is realized by optimizing t
he objective function through Minimax method. The gain and the bandwidth are reg
arded as the optimization aims. In order to eliminate the influence of the desig
n gain on the optimization process and get better result, normalized electric fi
eld is used to construct the target function. Finally, a dual-frequency and dual
-polarized single offset reflector antenna at Ku-band is optimized to generate t
he contoured beam covering the America territory. The numerical simulation
results show that both the up and down bandwidth are up to 1 000 MHz. |
| Key words: satellite borne antenna reflector antenna contoured beam dual-frequency and dual-polarized optimization
design |
