When designing a Chebyshev filter, it is important to note that the input and output impedances can only be equal for odd numbers of poles. In the table below, for example, this means that N must be 1, 3, 5, 7 or 9. The number of poles corresponds to the sum total number of inductors and capacitors.

Note also that for an odd pole filter, an even number of values is given. The rightmost value (which will be 1.0000) simply indicates that the load impedance is the same as the source impedance.

For even pole filters, to maintain the correct Chebyshev shape response, the load impedance must be different to the source impedance. Hence the value "5.8095" which is for the final load impedance.

N g1 g2 g3 g4 g5 g6 g7 g8 g9 g10 g11
011.99531.0000
023.10130.53395.8095
033.34870.71173.34871.0000
043.43890.74834.34710.59205.8095
053.48170.76184.53810.76183.48171.0000
063.50450.76854.60610.79294.46410.60335.8095
073.51820.77234.63860.80394.63860.77233.51821.0000
083.52770.77454.65750.80894.69900.80184.49900.60735.8095
093.53400.77604.66920.81184.72720.81184.66920.77603.53401.0000
103.53840.77714.67680.81364.74250.81644.72600.80514.51420.60915.8095
Chebyshev filter coefficients; 3 dB filter design (N=1 to 10)
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