Corrugated Horn

This antenna is a small corrugated horn.

Create a line with the following points :

(-0.013, 0, -0.035) => (-0.013, 0, 0) => (-0.013233, 0, 0001) => (-0.021233, 0, 0.001) => (-0.0217, 0, 0.003) => (-0.0137, 0, 0.003) => (-0.013933, 0, 0.004)

The successive teeth are created using the translation property

Erase the two lines in red and create a line : (-0.035, 0, 0.06) => (-0.038, 0, 0.06)

and extrude the lines to obtain :

Create the H and E symmetry plane, the waveguide source

Frequency : 11 GHz

Assign interface properties over surface, check the normals.

Mesh, save and run ICARE.

Computed 3D radiation pattern :

Another display of the radiation pattern to see the low cross polarization (as expected for a corrugated horn) :

The expert's tip :

A 3D MoM code like ICARE is not always the best choice for a corrugated circular horn. However, this example shows how easily GiD can be used to create periodic structures. IEEA also develops a MoM code for rotationally symmetric geometries well suited for such horns. Contact IEEA for more information about this tool called IEROS.