Design and determination for the front fed Cassegrain compact range
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摘要: 从理论、仿真及实验三方面证明了当前馈卡塞格伦紧缩场几何布局满足圆对称条件时,从几何光学角度来看,不会产生交叉极化的这一特性;同时对紧缩场布局设计及边齿参数作了优化设计,提出优化准则,并给出设计结果;根据布局结果制造了小型前馈卡塞格伦紧缩场K2010,对其幅度特性、相位特性及交叉极化在X波段、Ku波段及Ka波段进行实验测量;根据测量结果及仿真结果,对K2010的性能进行分析及总结.相对于其他类型紧缩场而言,前馈卡塞格伦紧缩场具有更大的口面利用系数和较低的交叉极化,可以满足卫星天线测量、交叉极化矩阵测量对极化纯度的要求.Abstract: In theory, simulation and experiment, it was proved that the cross-polarization is eliminated in geometric-optics condition when the geometries ofthe front fed Cassegrain compact range satisfy the Mizugutch condition. The optimization rule on the layout and serration of the compact range was referred to, then the optimization algorithm was performed and the result was given. The front fed Cassegrain compact range (the mode K2010) was developed. The amplitude character, phase character and cross-polarization character of the quiet zone were determined in X band, Ku band and Ka band, which was compared to the calculation results with the PO(physical optics) method. The performance of K2010 was analyzed from the simulation and experimental results. Compared to other types of compact range, the front fed Cassegrain compact range provides larger quiet zone and lower polarization, which satisfies the requirement to the polarization purity in the satellite test and polarization matrix measurement.
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Key words:
- compact range /
- front fed Cassegrain /
- cross-polarization /
- Mizugutch condition
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