An analysis method of multiband coaxial waveguide horns has been developed.
The method is based on a combination of the mode-matching (MM) method and
an integral-equation (IE) method. MM is used to analyze the multiport inter
nal region, where several concentric coaxial/circular waveguides are presen
t for the different bandwidths. The IE is used for the external region, all
owing an accurate analysis of the effect of the external feed shape. A comp
arison of the results obtained with some experimental data confirmed the ac
curacy of the method developed. (C) 2001 John Wiley & Sons, Inc.