不但如此，藉由使用全介電質膜堆濾波片來組成增溢平坦濾波片可說是一個創新的設計。此濾波片亦有每層皆為四分之一波厚之優勢。

And this also a new design for gain flattening filter by using stack of filters has been described. The filter has advantages of all the layers are quarter wave

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