[IEEE 21st European Microwave Conference, 1991 - Stuttgart, Germany (1991.10.4-1991.10.6)] 21st European Microwave Conference, 1991 - Generalized S-Matrix CAD of Aperture Coupled Bandpass, Bandstop, and Elliptic Function Waveguide FiltersArndt, F.; Papziner, U.; Sieverding, T. · 1991