一种非接触式高功率宽带同轴旋转关节OA

[Background]Rotary joints serve as critical feeder-link components in high-power mechanical beam-scanning antenna systems,ensuring efficient and stable radio-frequency energy transmission during antenna rotation.As high-power microwave technology steadily advances toward wideband operation,miniaturization,high efficiency,and high reliability,microwave rotary joints are required to meet correspondingly stringent demands.[Purpose]Compared with circular-waveguide rotary joints,coaxial rotary joints feature a more compact structure and offer better system adaptability in low-frequency bands.However,conventional coaxial rotary joints typically suffer from narrow bandwidth,insufficient power-handling capacity,and wear-prone contact-type structures.To satisfy the evolving requirements of high-power microwave systems,a broadband coaxial rotary joint with high power-handling capacity is needed.[Methods]This paper proposed a contactless high-power broadband coaxial rotary joint design that combined a stepped-waveguide multi-section impedance transformer with a novel choke structure,thereby achieving broadband and highly efficient rectangular TE10-coaxial TEM-rectangular TE10 mode conversion.[Results]The proposed structure was modeled and optimized using full-wave electromagnetic simulation software.Simulation results showed that over the 1.68-2.58 GHz frequency range,the device achieved a transmission efficiency greater than 99%,a return loss better than 20 dB,and a power-handling capacity on the gigawatt order,corresponding to a fractional bandwidth of up to 42%at a center frequency of 2 GHz.[Conclusions]The design collectively realizes high power-handling capacity,wide bandwidth,high efficiency,and contactless rotation,offering a high-performance rotary joint solution with promising engineering application prospects for high-power mechanical beam-scanning antenna systems.