求几篇论文:1.An effective technique for the synthesis of an equiripple low pass prototype filter with asymmetric frequency response and arbitrary transfer function zeros
2.悬置线带通滤波器和频分器的设计与研制
3.一种悬置基片带状线广义切贝雪夫带通滤波器
4.悬置带线带阻滤波器的设计
5.悬置微带线滤波器的研究
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