摘要
研究了宽角度扫描时侧馈偏置卡塞格伦反射面天线(SFOC)系统的远场特性。应用几何光学原理,对侧馈偏置卡塞格伦反射面天线的各项参数进行了设计。利用最小二乘法对反射面的最佳馈点位置进行了拟合,得到了最佳馈点位置的曲面图,并给出了馈源对副面的最佳指向。采用几何光学与基于傅立叶—贝塞尔方法的物理光学相结合的方法对扫描状态下给定尺寸的双反射面天线系统进行分析。方法具有分析速度快,精度高的优点。计算出了该天线的宽角扫描辐射特性和增益。计算结果表明,该天线在宽角扫描范围内,辐射方向图无太大畸变,增益损失小,效果好。
An analytic method of beam - scanning side - fed offset Cassegrain （ SFOC ） antennas is presented, The geometry optics theory is used to design the parameters of the offset Cassegrain dual - reflector antennas. The least -square method is utilized to fit the optimal feed positions （OFP）, and an optimal position feed curve （OPFC） is calculated. The optimal feed direction and the contour of the sub - surface are found. Then a method combining the geometrical optics （GO） with physical optics （PO） based on Fourier- Bessel technique is proposed. The hybrid dual - reflector analysis method presented in the dissertation is shown to have higher accuracy and efficiency. Computational results indicate that the radiation patterns of the SFOC antenna have little distortion and its gain loss is small within the wide -angle scanning region.
出处
《计算机仿真》
CSCD
北大核心
2009年第2期50-52,111,共4页
Computer Simulation
