超宽带天线中同轴到平板过渡研究
Investigation of coaxial to plane converter in UWB antenna
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摘要: 从理论上分析了渐变式传输线阻抗变换的反射与频率的关系，进而分析了同轴到平板过渡的电压驻波比关系式； 用3维FDTD方法动态模拟了瞬态脉冲信号在同轴到平板过渡中的传输过程，分析了信号在过渡中的损耗，设计了具有高功率容量的渐变式同轴到平板过渡和TEM喇叭天线，对渐变式同轴到平板过渡的反射和带过渡结构的天线方向图进行了测量。实验表明瞬态脉冲信号经过同轴到平板过渡没有产生畸变，适当选择过渡长度可使脉冲传输效率大于85%。实验结果验证了理论和数值模拟的结果。Abstract: The reflection of tapered transmission line impedance is analyzed in theory and the VSWR curve of coaxial to plane converter is drawn. Using the FDTD method, the transmission of coaxial to plane converter is simulated. And the loss of transmission is analyzed. A TEM horn antenna with coaxial to plane converter which can endure high power is made for experiment. The reflection of the converter and pattern in E-plane of the antenna are measured. The experiments verify that there is no aberrance when UWB pulse transmits through the converter, and the efficiency of transmission reaches 85% when the length of converter is long enough. The results of experiment accord with that of simulation and theory analysis.
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Key words:
- uwb pulse /
- coaxial to plane convertor /
- antenna
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