The paper developed a high-power microwave ultra-wideband coaxial rotary joint, and made some experimental study on its mechanical characteristics, temperature adaptability, transmission efficiency and power capability. The joint can work normally in the temperature range from -15 to 50 ℃. Fed in a pulse of 3 ns duration, it can realize a dynamic transmission efficiency of electric voltage of 99.14% with good stability. It can transmit transient pulses with ultra-wideband, peak power of 50 GW, repetition frequency of 100 Hz, and continuous action duration of 60 s. This rotary joint has been successfully applied to ultra-wideband vehicle-borne systems.
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