亚毫米波与太赫兹信号的频谱分析

Spectra analysis of submillimeter wave and THz signals

亚毫米波和太赫兹技术的发展对测试设备提出了更高的频率要求,可以采用频谱仪外接混频器的方式测量亚毫米波和太赫兹信号的频谱。基于谐波混频的原理,提出了利用较低频带的混频器测量更高频率的信号频谱的方法,试验中选用了一个W波段的无预选器的谐波混频器,测量对象是约0.2 THz的信号,利用Visual Basic语言编写程序对测试结果进行分析,测试结果表明这种方法切实可行。

The developments of submillimeter wave and THz technologies demand test instruments at higher frequencies. The spectra of the submillimeter wave and THz signals can be measured using external mixing techniques. According to the theory of harmonic mixing, a method to measure the spectra of the higher frequency signal using external mixer at lower frequency is put forward. A W band mixer is selected to measure a signal whose frequency is about 0.2 THz. A Visual Basic program is used to analyse the test results. The results show that the method is effective to measure the spectra of higher frequency signal using external mixer at lower frequency.