"Very short and efficient feeder design from monomode waveguide"

In this paper, we present an original and short corrugated horn antenna profile to obtain the HE/sub 11/ corrugated circular waveguide mode excited with a pure TE/sub 11/ monomode smooth circular waveguide mode. We obtain a far field pattern with a very low cross-polarization, high symmetry and very low sidelobes in a wide frequency band. The proposed corrugated antenna has a longitudinal section composed of two hyperbolic profiles in series, one concave and the other convex united at a point, such that the derivative is continuous. Superimposed there is an additional tapering of the corrugation depth that goes from /spl lambda//2 at taper input to /spl lambda//4 within the first hyperbola. This original synthesis procedure has been successfully tested by computational simulation. The calculation method has been validated with experimental results of other authors.