A MODIFIED CHEBYSHEV BANDPASS FILTER WITH ATTENUATION POLES IN THE STOPBAND

This paper describes a design method of a modified Chebyshev bandpass filter with attenuation poles in the stopband, The insertion of attenu ation poles into resonators in the authors' bandpass-filter design is accomplished by connecting a lumped Inductor or capacitor in series wi th a shunt-type coaxial transmission-line resonator, The inserted pole s which are distributed over the stopband can be chosen such that the insertion loss of the biter has equiripple characteristic and maximum attenuation in the stopband with the given number of attenuation poles , The modified Chebyshev bandpass filter designed by this method can b e effectively used in diplexer design.