Very short and efficient feeder design from monomode waveguide
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In this paper, we present an original and short corrugated horn antenna profile to obtain the HE11 corrugated circular waveguide mode exciting with a pure TE11 monomode smooth circular waveguide mode. We will obtain a far field pattern with a very low crosspolarization, 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 λ/2 at taper input to λ/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.
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