The analysis of Rotman lens

an important multiple beamforming network is accmplished by the contour integral equation method along with the planar waveguide medol method. First

the planar waveguide models for Roman lensand its feed lines which incorporate the dispersion effect with frequencies are set up. Then the aperture electric fields at lensports are expanded by appropriate waveguide mode functions and substituted into the contour integral equation. The multimode scattering rnatrix of the lens can be acquired by solving the cont0ur integral equation by using Galerkin method. To obtain the scattering matrix corresponding to the dominant mode

higher order modes aroused at lens ports are treated as loads ofthe network. It is proved that the calculated results are in good agreement with the experimental ones.