The graphical attenuation calculation methodology

A graphical technique for predicting the attenuation of a filter is described. The method centers around impedance paper and the use of several simple identities and is capable of solving for the attenuation of any multisection filter. The advantage of the method is that it gives the engineer intuitive insight into the operation of the filter, and possibilities for improvement. The weakness of the method is that it does not predict the effects of high-Q resonances in the filter. The method is also useful for powerline filter design