Antenna array

An antenna array comprising:

• a plate-shaped first electrically conductive member having a first electrically conductive surface;
• a plate-shaped second electrically conductive member having a second electrically conductive surface opposing the first electrically conductive surface;
• a ridge-like first waveguide member protruding from the second electrically conductive surface, the first waveguide member having an electrically-conductive waveguide face extending in opposition to the first electrically conductive surface, and one end of the first waveguide member reaching an edge of the second electrically conductive member;
• a ridge-like second waveguide member protruding from the second electrically conductive surface, the second waveguide member extending in parallel to the first waveguide member and having an electrically-conductive waveguide face which extends in opposition to the first electrically conductive surface, and one end of the second waveguide member reaching the edge of the second electrically conductive member;
• an artificial magnetic conductor extending around the first and second waveguide members in between the first and second electrically conductive members;
• an electrically-conductive first ridge pair, one of the first ridge pair protruding from the one end of the first waveguide member, and another of the first ridge pair protruding from a first portion of an edge of the first electrically conductive member that is opposed to the one end of the first waveguide member;
• and
• an electrically-conductive second ridge pair, one of the second ridge pair protruding from the one end of the second waveguide member, and another of the second ridge pair protruding from a second portion of the edge of the first electrically conductive member that is opposed to the one end of the second waveguide member, wherein,
• a first gap between the first ridge pair enlarges from a root toward an apex of the first ridge pair;
• a second gap between the second ridge pair enlarges from a root toward an apex of the second ridge pair;
• and,
• as viewed along the edge of the first electrically conductive member,
• at least a portion of the first gap and at least a portion of the second gap overlap each other, with no other intervening electrically-conductive member therebetween, or
• at least a portion of the first ridge pair and at least a portion of the second ridge pair overlap each other, with no other intervening electrically-conductive member therebetween.

An antenna array comprising:

• a plate-shaped first electrically conductive member having a first electrically conductive surface;
• a plate-shaped second electrically conductive member having a second electrically conductive surface opposing the first electrically conductive surface and a third electrically conductive surface on an opposite side from the second electrically conductive surface, the second electrically conductive member having a first slit at an end thereof;
• a plate-shaped third electrically conductive member having a fourth electrically conductive surface opposing the third electrically conductive surface, the third electrically conductive member having a second slit at an end thereof;
• the first artificial magnetic conductor extending around the first slit in between the first and second electrically conductive members;
• and
• a second artificial magnetic conductor extending around the second slit in between the second and third electrically conductive members, wherein,
• an edge of the second electrically conductive member has a shape defining an electrically-conductive first ridge pair connected to the first slit;
• an edge of the third electrically conductive member has a shape defining an electrically-conductive second ridge pair connected to the second slit;
• a first gap between the first ridge pair enlarges from a root toward an apex of the first ridge pair;
• a second gap between the second ridge pair enlarges from a root toward an apex of the second ridge pair;
• and,
• as viewed along a direction perpendicular to the first electrically conductive surface,
• at least a portion of the first gap and at least a portion of the second gap overlap each other, with no other intervening electrically-conductive member therebetween, or
• at least a portion of the first ridge pair and at least a portion of the second ridge pair overlap each other, with no other intervening electrically-conductive member therebetween.