Generalized bessel polynomials with application to the design of bandpass filters with approximately flat group delay response
Mohamed F. M. Fahmy · International Journal of Circuit Theory and Applications · 1977
Abstract The continued fraction expansion of the ordinary Bessel polynomials is modified by replacing the complex frequency variable p by p/(1+γp), where γ=⩾0. The resulting polynomials, when a reactance transformation is applied, are capable of providing bandpass filters with an approximately flat group delay response.