The element values of filters can be calculated by permutation method instead of the usual synthesis, i. e. successive complete and partial pole removals from the input impedances.
滤波器的元件值不是用一般的综合方法，即从输入阻抗中逐个移去全极点或部分极点，而是用极点交换法求得。
A corresponding mathematical model by applying an improved permutation method of multi-attribute decision analysis is established, and the practical calculation shows the method is feasible.
应用多属性决策分析中的一种改进排列法，建立了数学模型，并验证了其可行性。
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