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S.B. Karavashkin and O.N. Karavashkina Special Laboratory for Fundamental Elaboration SELF e-mail: email@example.com http://angelfire.lycos.com/la3/SELFlab http://angelfire.lycos.com/la3/selftrans
The features of oscillation pattern in mismatched finite electric ladder filters
ABSTRACT. Basing on the original relationship of the Dynamical ElectroMechanical Analogy DEMA and original exact analytical solutions for a lumped mechanical elastic line as an analogue, it is studied, how the load resistance effects on the amplitude-frequency and phase-frequency characteristics of mismatched finite ladder filters. It is shown that in filters of such type the indicated characteristics have a brightly expressed resonance form and essentially transform in the lower and medial domains of the pass band, changing insufficiently in the vicinity of cutoff frequency. It disables the conventional method to determine the total phase delay and the ladder filter transmission coefficient and requires finding the exact analytical solutions by way of the presented method. The obtained calculated regularities well agree with the experimental results for similar-parameters ladder filters. The obtained results can be extended to essentially more complicated ladder-filter circuits.