星载太赫兹辐射计天线系统设计与分析

设计了一套星载太赫兹辐射计天线系统, 分别由偏置大口径卡塞格伦反射面天线和前端准光学馈电网络组成, 可以实现300 GHz、380 GHz和425 GHz三个频率通道同步接收电磁波辐射信号.详细介绍了准光学馈电网络的设计原理以及馈电组件的设计过程, 通过仿真分析可以验证馈电网络的输出参数完全满足设计指标要求.还介绍了太赫兹辐射计天线模型的建立过程, 通过分析并计算各频率通道的远场辐射特性, 结果表明:天线系统具有高增益、高隔离度等良好的辐射特性, 其主要电性能参数, 如主波束效率、交叉极化水平等, 明显优于其他辐射计系统参数, 有效地验证了该天线系统设计方案的合理性与可行性.

Design and analysis of the terahertz radiometer antenna system on satellite

We designed a terahertz radiometer antenna which is composed of an off-set Cassegrain reflector antenna system and quasi-optical feed network. This antenna system can respectively receive the electromagnetic signals at the frequency of 300 GHz, 380 GHz, and 425 GHz. Firstly, the operational principle of feed network and quasi-optical components is analyzed in detail. The simulated results of feed network are satisfied with the requirements for antenna system. Secondly, the whole antenna system of radiometer is discussed and the far-field radiation pattern of each frequency range is calculated. The results are well demonstrated that the radiometer antenna system has good performances in high gain, high beam efficiency, and high cross-polar level, which are much better than other systems. Lastly, the feasibility and rationality of this radiometer antenna system are well proved.