Experimental study on propagation properties of 60 m×20 m×10 m TEM antennas
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摘要: 实验研究了长60 m、宽20 m、高10 m的大尺寸TEM天线的传输特性,其脉冲源采用薄膜开关与天线一体化设计,输出电压幅值可达10 kV,上升沿约1.2 ns。实测了TEM天线内部的电场分布,研究了该大尺寸TEM天线中电场分布规律,给出了脉冲上升沿与传输距离的关系、脉冲幅值与传输距离的关系，总结了快沿双指数波在天线中传输的高频损耗特性,给出了实验空间的选择方法。研究结果表明:上升沿随传输距离呈线性增大趋势,两极板中间测点增大速度最快,传输50 m距离,上升沿增大约1.2 ns；电场幅值随传输距离呈指数减小趋势。Abstract: The propagation properties of large size TEM antennas are experimentally studied. The size of the TEM antennas is 60 m20 m10 m and the character impedance is 120 . A kind of dielectric foil switch is designed compactly with TEM antennas which can generate a double exponential waveform with an altitude of 10 kV and a rise time of 1.2 ns. The radiated field distribution is measured. The relationship between the rise time/altitude and the distance is provided, and the propagation properties of large size TEM antennas are summarized. The results show that the rise time along the transmission distance increases. The transmission distance is 50 m and the rise time increases about 1.2 ns. An exponential decay trend of electric field amplitude with the transmission distance. This work is valuable for the design of large size guided wave simulator.
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Key words:
- TEM antennas /
- propagation properties /
- radiated field distribution /
- rise time /
- altitude
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