US 11,916,292 B1
Antenna apparatus
Byung Chul Park, Daejeon (KR); Kun Sup Kwon, Daejeon (KR); and Jong Wan Heo, Daejeon (KR)
Assigned to AGENCY FOR DEFENSE DEVELOPMENT, Daejeon (KR)
Filed by AGENCY FOR DEFENSE DEVELOPMENT, Daejeon (KR)
Filed on Feb. 2, 2023, as Appl. No. 18/104,953.
Claims priority of application No. 10-2022-0102870 (KR), filed on Aug. 17, 2022.
Int. Cl. H01Q 13/02 (2006.01); H01Q 13/18 (2006.01); H01P 3/123 (2006.01)
CPC H01Q 13/0275 (2013.01) [H01P 3/123 (2013.01); H01Q 13/0225 (2013.01); H01Q 13/18 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An antenna apparatus, comprising:
a hollow pillar shaped waveguide extending in a first direction;
at least one ridge protruding from an inner circumferential surface of the waveguide and extending in the first direction; and
an iris structure protruding from the inner circumferential surface of the waveguide along a plane intersecting the first direction,
wherein the ridge has at least one recessed groove formed in the first direction,
wherein the ridge comprises a first portion having the recessed groove and a plurality of second portions that are connected to both sides of the first portion and are not recessed,
wherein the degree of protrusion of the recessed groove of the first portion from the inner circumferential surface of the waveguide is maintained uniformly,
wherein a length in a radial direction of the waveguide of the first portion is less than a length in a radial direction of each of the second portion.