An antenna apparatus comprising: a circuit board constituted by a plurality of layers; a plurality of first via holes formed in each of the layers, and via pads provided between a first layer and a second layer adjacent thereto, wherein the first via holes arranged in the first layer in a horizontal direction are aligned with the first via holes formed in the second layer to form a grid type radiating member, wherein the via pads connect the first via holes formed in the first layer and the first via holes formed in the second layer, wherein a plurality of grid type radiating members being disposed in the circuit board, and wherein the antenna apparatus further comprises artificial magnetic conductor, AMC, elements provided between the plurality of grid type radiating members, respectively, characterized in that the AMC element comprises: a plurality of second via holes formed in each of the layers and being arranged in a second horizontal direction perpendicular to that in which the first via holes are arranged, respectively, and second via pads provided between the first layer and the second layer adjacent to the first layer, wherein the second via holes formed in the first layer are aligned with the second via holes formed in the second layer to form a grid type AMC, and wherein the second via pads connect the second via holes formed in the first layer and the second via holes formed in the second layer. a circuit board constituted by a plurality of layers; a plurality of first via holes formed in each of the layers, and via pads provided between a first layer and a second layer adjacent thereto, wherein the first via holes arranged in the first layer in a horizontal direction are aligned with the first via holes formed in the second layer to form a grid type radiating member, wherein the via pads connect the first via holes formed in the first layer and the first via holes formed in the second layer, wherein a plurality of grid type radiating members being disposed in the circuit board, and wherein the antenna apparatus further comprises artificial magnetic conductor, AMC, elements provided between the plurality of grid type radiating members, respectively, characterized in that the AMC element comprises: a plurality of second via holes formed in each of the layers and being arranged in a second horizontal direction perpendicular to that in which the first via holes are arranged, respectively, and second via pads provided between the first layer and the second layer adjacent to the first layer, wherein the second via holes formed in the first layer are aligned with the second via holes formed in the second layer to form a grid type AMC, and wherein the second via pads connect the second via holes formed in the first layer and the second via holes formed in the second layer. a plurality of second via holes formed in each of the layers and being arranged in a second horizontal direction perpendicular to that in which the first via holes are arranged, respectively, and second via pads provided between the first layer and the second layer adjacent to the first layer, wherein the second via holes formed in the first layer are aligned with the second via holes formed in the second layer to form a grid type AMC, and wherein the second via pads connect the second via holes formed in the first layer and the second via holes formed in the second layer.