●●● ●●● 5.1 Filter Design by the Insertion ●●●● ●●●● ●●●● Loss Method ●●●● ●●● Ideal filters have √Zero insertion loss in the passband;通带内零插损 √Infinite attenuation in the stopband;阻带内衰减无限大 √Linear phase response in the passband,.通带内相位线性 Compromises must be made. The insertion loss method allow a high degree of control over the passband and stopband amplitude and phase characteristics. 插入损耗法能够方便地控制带内和带外的幅度和相位 1.Characterization by Power Loss Ratio 2.Maximally Flat Low-pass Filter prototype. 3.Equal-Ripple Low-pass Filter prototype. 5§5.1 Filter Design by the Insertion Loss Method Ideal filters have Zero insertion loss in the passband;通带内零插损 Infinite attenuation in the stopband ;阻带内衰减无限大 Linear phase response in the passband.通带内相位线性 Compromises must be made. The insertion loss method allow a high degree of control over the passband and stopband amplitude and phase characteristics. 插入损耗法能够方便地控制带内和带外的幅度和相位 1. Characterization by Power Loss Ratio 2. Maximally Flat Low–pass Filter prototype. 3. Equal–Ripple Low–pass Filter prototype. 5