D. Budimir, OPTIMIZED E-PLANE BANDPASS-FILTERS WITH IMPROVED STOPBAND PERFORMANCE, IEEE transactions on microwave theory and techniques, 45(2), 1997, pp. 212-220
A computer-aided synthesis technique for E-plane bandpass filters with
improved stopband performance is developed. An optimization procedure
based on equal ripple optimization is adopted. The design of a symmet
rical E-plane bandpass filter with improved stopband performance is co
nsidered; higher order mode interaction between E-plane discontinuitie
s is included in the design, The predicted filter performance shows im
proved stopband performance and reduced filter dimensions compared wit
h conventional E-plane bandpass filters. The validity of the method is
confirmed by the measurement of a fabricated five resonator E-plane b
andpass filter with improved stopband performance.