Antenna device

An antenna device comprising:

• a. an antenna plate having a front face and a back face;
• b. at least one waveguide channel segment having a front section and a back section arranged in the antenna plate extending in a first direction parallel to the front face in the antenna plate;
• c. waveguide apertures arranged in the antenna plate extending between and interconnecting the front section of the waveguide channel segment and the front face of the antenna plate;
• d. at least one of the front section and the back section comprise indentations in the form of protrusions extending from a channel wall into at least one of the front section and the back section of the waveguide channel segment;
• e. wherein the waveguide apertures in the region of their rear end have a cross-section—with a longer extension and a shorter extension;
• wherein
• f. the longer extension of the cross-section is arranged essentially parallel to the first direction and the shorter extension is arranged essentially perpendicular to the first direction;
• and wherein
• g. between the waveguide apertures third protrusions are arranged alternately in the back section of the waveguide channel segment with respect to the first direction, wherein the third protrusions are configured to compress the guided wavelength in the first direction within the waveguide channel segment.

An antenna device comprising

• a. an antenna plate having a front face and a back face;
• b. at least one waveguide channel segment having a front section and a back section arranged in the antenna plate extending in a first direction parallel to the front face in the antenna plate;
• c. waveguide apertures arranged in the antenna plate extending between and interconnecting the front section of the waveguide channel segment and the front face of the antenna plate;
• d. at least one of the front section and the back section comprise indentations in the form of protrusions extending from a channel wall into at least one of the front section and the back section of the waveguide channel segment;
• wherein
• e. the waveguide apertures in the region of their rear end have a cross-section with a longer extension and a shorter extension;
• and wherein
• f. the cross-section is arranged angularly displaced by an angle α with respect to the first direction of the waveguide channel segment;
• g. between neighboring waveguide apertures alternately first and second protrusions are arranged in the front section of the waveguide channel segment;
• and
• h. between waveguide apertures third protrusions are arranged alternately in the back section of the waveguide channel segment with respect to the first direction.