Patent ID: 9112279
Filing Date: 2015-08-18
Classification: H01Q,Y10T

Abstract:
1. A mode filter for a horn antenna having at least one radiating element with at least one horn aperture, the mode filter comprising: at least one waveguide extension to extend the at least one element horn aperture; and at least one two-by-two (2×2) array of quad-ridged waveguide sections connected to the respective at least one waveguide extension, wherein, when the at least one waveguide extension is positioned between the at least one horn aperture and the at least one 2×2 array of quad-ridged waveguide sections, undesired electromagnetic modes of the horn antenna are suppressed, wherein a portion of at least one of the at least one 2×2 array of quad-ridged waveguide sections extends at least partially into the respective at least one of the at least one waveguide extension.