A frequency transformation expression from triple-band filter to low-pass prototype filter is presented, and the synthesis theory for in-line and cross-coupled triple-band filter is developed.
三、提出了三通带滤波器到归一化低通原型滤波器的频率变换公式,建立了级联型和交叉耦合型三通带滤波器的综合理论。
参考来源 - 基于频率变换法的多通带微波滤波器综合方法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
This article analyses the applications and procedures in frequency transformation of multiplier from principle.
该文从原理上分析了相乘器在频率变换中的应用及过程。
This paper tries to discuss the work principle of frequency transformation on the circuit where diodes work on on-off speciality.
该文系统地讨论二极管工作在开关特性下所组成电路的频率变换的工作原理。
The key of realizing convolution filter, which processes discrete signals, is to design expectant frequency transformation of filters.
实现对离散信号数字处理的卷积滤波关键是设计期望的滤波器频谱。
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