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The microwave devices of the radar system play different roles in various channels. It is very important for maintenance personnel to know their shapes, functions, principles, and fault identification. The working principles, specifications, fault identification of microwave devices in the CINRAD/SA radar system, such as receiver protector, BAW microwave delay line, passive limiter and so on, are discussed, so as to further understand those devices and identify the faults in the CINRAD/SA radar system.