一种宽带大功率同轴窗研究

Novel Type of Wide-Band High-Power Coaxial Window

针对半波长同轴窗与同轴陶瓷行波窗存在的带宽窄、功率容量低的局限,本文提出了一种宽带大功率同轴窗结构,并给出了其设计原理。利用HFSS与CST Microwave Studio优化设计了L波段宽带大功率同轴窗,并与半波长同轴窗与陶瓷行波同轴窗进行了性能对比分析。模拟结果表明,宽带大功率同轴窗相比半波长同轴窗与陶瓷行波同轴窗具有更宽的带宽与更高的功率容量。优化设计的L波段宽带大功率同轴窗,其-30 dB带宽约为行波同轴窗的2.5倍,窗片区域的电场与行波同轴窗相当,为半波长同轴窗的一半以下。匹配膜片附近的电场幅度降低至行波同轴窗的75%。CST仿真显示,膜片与间隙的尺寸与位置对宽带大功率同轴窗的带宽影响明显,而对电场分布的影响较弱,因而可以通过调整膜片与间隙获得宽带宽与高功率容量。同时,电场强度轴向分布随频率变化不大。宽带大功率同轴窗在整个宽频带内具有高功率容量。

A novel type of L-band,wide-band high-power coaxial window was designed and evaluated via numerical simulation with soft-ware HFSS and CST Microwave Studio,to increase the bandwidth and power capacity of traveling-wave in ceramic（TWC） coaxial window.The simulated results show that the newly-designed coaxial window has wider bandwidth and higher power capacity than the half-wavelength and TWC coaxial windows;and that the bandwidth and power capacity can be increased by adjusting the size and location of the iris and the gap,and the frequency little affects the axial field distribution.To be specific,the-30 dB bandwidth of the new coaxial window was about 2.5 times wider than that of the TWC coaxial window：and the electric field around the ceramic window was much lower than that of half-wavelength coaxial window.The electric field around the matching-iris decreased to 75%of that of TWC coaxial window.