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Element Coefficients for Symmetrical Two-Section Filters Having Tchebycheff Response in Both Pass and Stop Bands

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1 Author(s)

Element coefficients for a normalized symmetrical low-pass filter, having "equal ripple" response in both pass and stop bands, are presented graphically. The coefficients are plotted against the relative selectivity of the filter, with a loss factor as independent parameter. The interval between curves is sufficiently small to permit interpolation with an accuracy of \pm 1 per cent. Frequency and impedance transformations are included to allow the elements of a practical filter to be derived from those of the appropriate normalized design. The loss function corresponding to a particular design is readily formulated in terms of the loss factor above and the appropriate frequencies of zero loss.

Published in:

IRE Transactions on Circuit Theory  (Volume:7 ,  Issue: 1 )