Radiating element, antenna array, and radar

An antenna array which performs at least one of transmission and reception of an electromagnetic wave, the antenna array comprising a waveguide component,

• the waveguide component including:
• an electrically conductive member having an electrically conductive surface;
• a plurality of waveguide members each having electrically conductive waveguide face opposing the electrically conductive surface, each of the waveguide faces having a stripe shape extending alongside the electrically conductive surface, the waveguide face extending along a first direction at an end thereof;
• and
• an artificial magnetic conductor extending on both sides of the plurality of the waveguide members, wherein
• the electrically conductive surface extends along the first direction and along a second direction which is perpendicular to the first direction;
• the waveguide faces, together with the electrically conductive surface, respectively define waveguiding gaps;
• the electrically conductive surface has an edge extending along the second direction;
• ends of the waveguide gaps respectively extend toward positions at the edge of the electrically conductive surface;
• each of the waveguiding gaps is open to an external space at the end thereof;
• and
• the ends of the waveguide faces of the plurality of waveguide members constitute a row along the second direction.

An antenna array which performs at least one of transmission and reception of an electromagnetic wave with a plurality of radiating elements, the antenna array comprising a plurality of stacked waveguide components,

• each waveguide component including:
• an electrically conductive member having an electrically conductive surface;
• at least one waveguide member having an electrically conductive waveguide face opposing the electrically conductive surface, the waveguide face having a stripe shape extending alongside the electrically conductive surface;
• and
• an artificial magnetic conductor extending on both sides of the waveguide member, wherein
• a waveguiding gap between the waveguide face and the electrically conductive surface is open to an external space at an end of the waveguiding gap, and defines one of the plurality of radiating elements.