i need this filter design paper plz help me

A design method for improvement of g/4 coupled-line narrow bandpass filter response
G. Prigent, E. Rius, F. Le Pennec, S. Le Maguer
LEST (Laboratoire d'Electronique et Systèmes de Télécommunications), UMR CNRS 6165, 6, Avenue Le Gorgeu, BP 809, 29285 Brest, France


Keywords
narrow bandpass filter ? insertion losses improvement ? tapped-lines feedings ? transmission zero ? folded filter

thank you angolax