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本文用快速傅里叶变换对LT GaAs衬底共面微带传输线光生超短电脉冲的时域传输特性进行了数值计算 结果表明 ,THz以上高频范围的模式色散、LT GaAs衬底切伦科夫辐射衰减使超短电脉冲信号沿LT GaAs衬底共面微带传输线超传输时波形畸变 ,初始光生电脉冲越窄 ,则信号波形畸变越严重 减簿衬底厚度可降低LT GaAs衬底共面微带传输线的模式色散和辐射衰减 ,有利于改善LT GaAs衬底共面微带传输线亚皮秒超短电脉冲的传输特性
In this paper, the fast Fourier transform (LTFT) is used to calculate the time-domain propagation characteristics of photogenerated ultrashort electrical pulses in coplanar microstrip transmission line of LT GaAs substrate. The results show that the chromatic dispersion of high frequency region above THz, Fu radiation attenuation makes the ultrashort electrical pulse signal waveform distortion along the LT GaAs substrate coplanar microstrip transmission line ultra-transmission, the narrower the initial photogenerated pulse, the more serious the waveform distortion of the signal reduced substrate thickness can be reduced LT GaAs substrates Mode dispersion and radiation attenuation of the surface microstrip transmission line are beneficial to improve transmission characteristics of sub-picosecond ultrashort electrical pulse of the LT GaAs substrate coplanar microstrip transmission line