波束组合器微波传输特性的实验研究

Analysis of the Microwave Transmission Characteristics of Dichroic Beam Combiner

波束组合器是复合制导半实物仿真系统中的关键设备,为了分析半实物仿真系统中微波传输过程和有效地研究波束组合器对微波场的影响,利用四端口网络法对该波束组合器的结构进行了设计。针对波束组合器对微波传输特性的影响进行了实验研究,主要包括微波传输振幅的衰减和微波传输方向的变化情况。同时建立了该系统的理论模型,最后采用物理光学法对框架绕射引起的相对相位变化进行了仿真验证,仿真结果和实测结果相符合,即不同微波频率造成的波束组合器的振幅衰减和微波传播方向不同,发射天线的偏移会引起振幅和相对相位差变化。

Dichroic beam combiner is the essential equipment of dual-mode guiding simulation system. In order to in- vestigate the effect of microwave transmission characteristics of the dichroic beam combiner , including the amplitude attenua-tion and the vary of transmission direction , the combiner testing system is designed and established as well as its theoretical model has also been established. Then, the theory of its system is analyzed and confirmed by using the four-terminal network theory. Finally the theoretical result matches the experimental result basically, it confirms that the microware frequency and the position of antenna can affect the amplitude and the received phase of microware.