λ/4耦合传输线最大平坦滤波器QD设计  

Maximally Flat Quarter-Wavelength-Coupled Transmission-Line Filters Using QD Design

作　　者：王建成[1] 郑新[1] 

机构地区：[1]指挥技术学院测量控制系

出　　处：《指挥技术学院学报》1999年第3期63-66,共4页Journal of Institute of Command and Technology

摘　　要：介绍了一种利用任意谐振元件的精确设计最大平坦型λ／４耦合传输线滤波器的新技术。目前采用的基于集总元件低通原型设计方法所产生的仅仅是近似最大平坦，同时，不能准确预言滤波器的总Ｑ值。本文介绍的ＱＤ法完全克服了这些问题。利用ＱＤ法设计滤波器时，仅需选择谐振元件的节数、类型及所需的总Ｑ值，就可获得每个谐振元件的ＱＤ值，这就为选择最适合的谐振元件带来了巨大的设计灵活性。This paper presents a technique for accurately designing maximally flat quatrer-wavelength-coupled transmission-line filters using arbitrary resonant elements. The design procedure currently used, which is based on the lumped-element low-pass prototype, yields a response that is only approximately maximally flat. In addition, the current procedure results in an inaccurate prediction of the total Q for the filter. The technique presented in this paper, herein called the Q-distribution (QD)method, corrects these problems. With the QD method, the designer chooses the number and type of resonant elements and the total Q desired. In return, the designer is provided with the individual resonator QD, which gives the designer flexibility in selecting the resonator that is most appropriate.

关 键 词：巴特沃斯 滤波器 最大幅度平坦 QD λ/4耦合 

分 类 号：TN713[电子电信—电路与系统]