广义切比雪夫带通滤波器直接综合方法研究

Direct Synthesis Technology of Filters with General Chebyshev Characteristic

传统的广义切比雪夫滤波器综合方法从低通原型出发,经过频率变换,得到相应的带通滤波器等效电路模型。然而,基于这种间接综合方法所得到的交叉耦合矩阵却只适用于窄带情形。文章讨论了一种广义切比雪夫滤波器直接综合方法,能直接在带通领域里进行综合,可用于综合宽带带通滤波器,且传输零点位于任意频率处,所导出的网络矩阵具备物理意义。

Conventional synthesis techniques for bandpass filters usually start from lowpass prototype and then use fre- quency transformation to obtain bandpass filters with general characteristic. However, coupling matrix derived from this indi- rect technology is accurate only for narrow - bandwidth applications. In this paper, a synthesis technology is discussed in this paper which can synthesize bandpass filters directly in bandpass domain and be used to synthesize bandpass filters with wide bandwidth and arbitrarily -placed transmission zeros. Network matrix derived by the discussed technique is physically meaningful.