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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300GHz、380GHz和425GHz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.
A set of spaceborne terahertz radiometer antenna system is designed, which consists of a biased large-caliber Cassegrain reflector antenna and a front-end quasi- optical feed network, which can simultaneously receive electromagnetic radiation at three frequency channels of 300GHz, 380GHz and 425GHz Signal.The design principle of the quasi-optical feed network and the design process of the feeding components are introduced in detail.The output parameters of the feed network can be verified by the simulation analysis to fully meet the design requirements, and the establishment of the antenna model of the terahertz radiometer By analyzing and calculating the far-field radiation characteristics of each frequency channel, the results show that the antenna system has good radiation characteristics such as high gain and high isolation, and its main electrical performance parameters such as main beam efficiency and cross-polarization level are obvious Which is superior to other radiometer system parameters and validates the rationality and feasibility of the antenna system design.