光激发LT-GaAs共面微带传输线THz色散与衰减特性

TERAHERTZ DISPERSION AND ATTENUATION CHARACTERISTICS OF OPTICALLY EXCITED COPLANAR STRIPLINES ON LT GaAs 

采用半经验色散公式分析了 L T- Ga As厚衬底共面微带传输线的 THz模式色散与切伦柯夫辐射损耗特性 ,同时计算了导体欧姆损耗和衬底介电损耗 .结果表明 ,较小的横向尺寸有利于改善 L T- Ga As共面微带传输线模式色散和辐射损耗特性 。

By employing the semiempirical dispersion formula for coplanar transmission lines, the mode dispersion and Cerenkov radiative attenuation characteristics in the frequency domain over a terahertz range of coplanar striplines on thick LT GaAs substrate were analyzed. The analytical result reveals that the radiative attenuation and the mode dispersion characteristics can be improved by reducing the total linewidth,and that a greater aspect ratio should be designed to reduce the conductor loss.