相对带宽是红外中带滤光片重要的指标，主要取决于光学薄膜的膜系结构和具体设计。
Relative bandwidth is a key specification for the medium bandpass infrared filter, which depends on the film structure and its design.
普通多层膜系结构光子晶体的禁带内能量损失较低，可是禁带宽度通常有限，而且出现较宽的全角高反带很难。
Although the energy loss of ordinary multi-layer photonic crystal structures is low, the band gap is usually limited, there is also wide-wide Angle high anti-band hard.
以膜系设计理论为基础，通过膜堆的叠加来展宽反射带，结合针法优化，设计出滤光膜的膜系。
The film stack is got through the film pile being stacked based on the theory of the design, combining with the needle optimization, and designing the filter of the film.
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