Bessel Filter Poles

Visit the Anatech Electronics websiteBessel poles lie along a circle similar to the Butterworth filter, but are spaced approximately equal distances apart relative to the real axis rather than at equal angular distances. Prototype value real and imaginary pole locations (ω=1 at the 3dB cutoff point) for Bessel filters are presented in the table below.

This pole-zero diagram shows the location of poles for a 4th-order Bessel lowpass filter.

4th-order lowpass Bessel filter pole-zero diagram - RF Cafe






Bessel filter prototype element values are here.

Bessel function plots can be found here.


Data taken from "Filter Design," by Steve Winder, Newnes Press, 1998. This is a great filter design book, and I recommend you purchase a copy of it.

Order (N)Re Part (-σ)Im Part (±jω)
11.0000 
21.10300.6368
31.0509
1.3270
1.0025
41.3596
0.9877
0.4071
1.2476
51.3851
0.9606
1.5069
0.7201
1.4756
61.5735
1.3836
0.9318
0.3213
0.9727
1.6640
71.6130
1.3797
0.9104
1.6853
0.5896
1.1923
1.8375
81.7627
0.8955
1.3780
1.6419
0.2737
2.0044
1.3926
0.8253
91.8081
1.6532
1.3683
0.8788
1.8575
0.5126
1.0319
1.5685
2.1509
101.9335
0.8684
1.8478
1.6669
1.3649
0.2424
2.2996
0.7295
1.2248
1.7388

















 
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