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Bessel Filter Prototype Element Values
See the online filter calculators and plotters here. Complex poles are here. Denormalization of values is here.
The table below lists prototype element values for the normalized lowpass function, which assumes a cutoff frequency of 1 rad/sec and source and load impedances of 1 Ω. Either an input capacitor (top reference line in table) or an input inductor (bottom line in table) can be used.
Convert values to other cutoff frequencies, impedances, and to highpass, bandpass or bandstop using the equations here.
Capacitor Input
Inductor Input
Order
C1
L2
C3
L4
C5
L6
C7
L8
C9
L10
1
2.000
2
0.576
2.148
3
0.3374
0.9705
2.2034
4
0.2334
0.6725
1.0815
2.2404
5
0.1743
0.5072
0.804
1.111
2.2582
6
0.1365
0.4002
0.6392
0.8538
1.1126
2.2645
7
0.1106
0.3259
0.5249
0.702
0.869
1.1052
2.2659
8
0.0919
0.2719
0.4409
0.5936
0.7303
0.8695
1.0956
2.2656
9
0.078
0.2313
0.377
0.5108
0.6306
0.7407
0.8639
1.0863
2.2649
10
0.0672
0.1998
0.327
0.4454
0.5528
0.6493
0.742
0.8561
1.0781
2.2641
L1
C2
L3
C4
L5
C6
L7
C8
L9
C10
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RF Cafe Erie, PA (814) 833-1967
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