Pole of Bessel Filter of degree 1

p₁ = -1

Poles of Bessel Filter of degree 2

p₁ = (-1.5,0.8660254038)

p₂ = (-1.5,-0.8660254038)

Poles of Bessel Filter of degree 3

p₁ = (-1.838907323,1.75438096)

p₂ = -2.322185355

p₃ = (-1.838907323,-1.75438096)

Poles of Bessel Filter of degree 4

p₁ = (-2.103789397,2.657418042)

p₂ = (-2.896210603,0.8672341289)

p₃ = (-2.896210603,-0.8672341289)

p₄ = (-2.103789397,-2.657418042)

Poles of Bessel Filter of degree 5

p₁ = (-2.324674303,3.57102292)

p₂ = (-3.351956399,1.742661416)

p₃ = -3.646738595

p₄ = (-3.351956399,-1.742661416)

p₅ = (-2.324674303,-3.57102292)

Poles of Bessel Filter of degree 6

p₁ = (-2.515932248,4.492672954)

p₂ = (-3.735708356,2.626272311)

p₃ = (-4.248359396,0.8675096732)

p₄ = (-4.248359396,-0.8675096732)

p₅ = (-3.735708356,-2.626272311)

p₆ = (-2.515932248,-4.492672954)

Poles of Bessel Filter of degree 7

p₁ = (-2.685676879,5.420694131)

p₂ = (-4.070139164,3.517174048)

p₃ = (-4.758290528,1.739286061)

p₄ = -4.971786859

p₅ = (-4.758290528,-1.739286061)

p₆ = (-4.070139164,-3.517174048)

p₇ = (-2.685676879,-5.420694131)

Poles of Bessel Filter of degree 8

p₁ = (-2.838983949,6.353911299)

p₂ = (-4.368289217,4.4144425)

p₃ = (-5.204840791,2.616175153)

p₄ = (-5.587886043,0.8676144454)

p₅ = (-5.587886043,-0.8676144454)

p₆ = (-5.204840791,-2.616175153)

p₇ = (-4.368289217,-4.4144425)

p₈ = (-2.838983949,-6.353911299)

Poles of Bessel Filter of degree 9

p₁ = (-2.979260798,7.291463688)

p₂ = (-4.638439887,5.317271675)

p₃ = (-5.60442182,3.498156918)

p₄ = (-6.129367904,1.737848383)

p₅ = -6.297019182

p₆ = (-6.129367904,-1.737848383)

p₇ = (-5.60442182,-3.498156918)

p₈ = (-4.638439887,-5.317271675)

p₉ = (-2.979260798,-7.291463688)

Poles of Bessel Filter of degree 10

p₁ = (-3.108916234,8.232699459)

p₂ = (-4.886219567,6.224985482)

p₃ = (-5.967528329,4.384947189)

p₄ = (-6.615290965,2.611567921)

p₅ = (-6.922044905,0.8676651955)

p₆ = (-6.922044905,-0.8676651955)

p₇ = (-6.615290965,-2.611567921)

p₈ = (-5.967528329,-4.384947189)

p₉ = (-4.886219567,-6.224985482)

p₁₀ = (-3.108916234,-8.232699459)