Microwave Linear Phase Filters

This work presents an exact method for construction of a new nonminimum phase maximally flat transfer function with ideal amplitude pulsation at an arbitrary frequency wo and linear phase response. This transfer funcction is based on a polinomial obtained combining two succesive Bessel polynomials. A generalized interdigital filter was built using the new transfer function and the experimental results presented here show that this new class of nonminimum phase filters can be builtin practice, offering an improvement of attenuation response in the rection band.