【摘要】 采用信号处理的方法,对介质膜滤波器的滤波特性进行了详细的研究。介质膜滤波器是最小相位滤波器,它的幅度响应与相位响应之间存在希尔伯特变换规律,因此可以通过它的幅度响应重构它的相位响应,进而可以得到它的色散特性。为了验证理论分析,设计了射频调制法测试介质膜滤波器群速度延时的实验装置。实验测试了一个100 GHz 33信道的介质膜滤波器的群速度延迟。通过对实验结果与理论计算结果的对比分析,发现实验数据与理论分析吻合得比较好。最后,对介质膜滤波器的色散的特点进行了分析。更多还原

【Abstract】 Based on signal processing theory, the filtering characteristic of thin film filter was researched in detail. Thin film filter is minimum phase filter (MPF) and Hilbert transform law is related with the amplitude response and the phase response. So the phase response can be reconstructed from its amplitude response and then the characteristic of chromatic dispersion can be achieved. To validate the theoretical analysis, a test system for group velocity delay was set up based on RF modulation. As an example, the group velocity delay of a 100 GHz 33CH thin film filter was tested. The experimental result matched with the theoretical result very well through contrasting analysis. At last, an analysis of the characteristic of chromatic dispersion of thin film filter was also provided.更多还原