利用太赫兹时域光谱系统(THz-TDS)对Sierpinski分形结构太赫兹透射特性进行了研究，结果表明：太赫兹脉冲通过Sierpinski分形结构会产生多个透射通带与禁带，透射通带与禁带的位置对样品结构存在一定的尺度依赖性。随着结构阵列的增加，透射峰与禁带都有加强的趋势。通过对缺级样品的分析，进而得出：透射峰与禁带的产生主要是由于方孔对太赫兹波的耦合作用，且不同的透射峰与禁带是由不同阶孔对太赫兹波的耦合作用产生的：低频区的透射峰与禁带主要是由低级分形方孔对太赫兹波的耦合引起的，高频区的透射峰与禁带主要是由高级分形方孔对太赫兹波的耦合作用引起的。

The enhanced transmission spectra of sub-wavelength Sierpinski fractal structure are presented by means of THz time domain spectroscopy (THz-TDS). It is found that there are several transmission peaks and forbidden band gaps with the frequency selectivity in the transmission spectra. The transmission peaks and forbidden band gaps increase with increase of the structure arrays. Further analysis reveals that the transmission enhancement is caused by a complicated waveguide coupling effect, that is, THz transmission enhanced in low frequency region mainly results from the waveguide coupling in low level square holes, while in high frequency region mainly results from the waveguide coupling in high level square holes.