Abstract
The cross polarization caused by a perturbed cross section of the conical hybrid-mode horn is analyzed. The perturbed cross section is assumed to be slightly elliptical. The theory previously presented for cross polarization in a smooth-walled waveguide supporting the TE_{11} - mode is referred and applied to the HE_{11} -mode as well. Simple analytical formulas which are sufficiently accurate for small ellipticites of the cross-section ellipse are presented. These show that the tolerances on the waveguide diameter are extremely strong, typically on the order of 2 to 4 \times 10^{-2} mm in the horn throat for typical horn geometries at 12 GHz.
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