Abstract: An antenna structure according to an embodiment of the present disclosure includes a dielectric layer, and an antenna unit disposed on a top surface of the dielectric layer. The antenna unit includes a radiator including convex portions and concave portions, a transmission line including a first transmission line and a second transmission line that extend in different directions to be connected to the radiator, and a parasitic element disposed to be adjacent to the transmission line and electrically and physically separated from the transmission line and the radiator. A length of the parasitic element in an extension direction of the transmission line is from 45% to 70% of a half wavelength (?/2) at a maximum resonance frequency from the antenna unit.

Abstract: An antenna device according to embodiments includes a dielectric layer having a central portion and a peripheral portion, a first antenna unit disposed on a top surface of the dielectric layer and including a first radiator providing a vertical radiation from the top surface of the dielectric layer, and a second antenna unit spaced apart from the first antenna unit on a plan view and comprising a second radiator providing an omni-directional radiation.

Abstract: An antenna device according to an embodiments of the present invention includes a substrate layer, a ground layer disposed on a bottom surface of the substrate layer, a radiation control layer disposed on a top surface of the substrate layer, the radiation control layer including a plurality of radiation control patterns formed of a conductive mesh structure, each of the radiation control patterns having a hollow portion, an antenna dielectric layer disposed on the radiation control layer, and an antenna unit disposed on the antenna dielectric layer.

Abstract: An antenna structure according to an embodiment of the present disclosure includes a dielectric layer, and an antenna unit disposed on a top surface of the dielectric layer. The antenna unit includes a radiator including convex portions and concave portions, a transmission line including a first transmission line and a second transmission line that extend in different directions to be connected to the radiator, and a parasitic element disposed to be adjacent to the transmission line and electrically and physically separated from the transmission line and the radiator. A length of the parasitic element in an extension direction of the transmission line is from 45% to 70% of a half wavelength (?/2) at a maximum resonance frequency from the antenna unit.

Abstract: An antenna structure according to an embodiment of the present disclosure includes a dielectric layer, and a plurality of antenna units arranged on a top surface of the dielectric layer. Each of the plurality of antenna units includes a radiator, a transmission line including a first transmission line and a second transmission line that extend in different directions to be connected to the radiator, an upper parasitic element adjacent to an upper portion of the radiator, and a lower parasitic element adjacent to a lower portion of the radiator and the transmission line. Feeding signals of different phases are applied to the first transmission line and the second transmission line.

Abstract: An antenna structure according to an embodiment of the present disclosure includes a dielectric layer and a plurality of antenna units arranged on a top surface of the dielectric layer. Each of the plurality of antenna units includes a radiator, a first transmission line and a second transmission line extending in different directions to be connected to the radiator, an upper parasitic element adjacent to an upper portion of the radiator, and a lower parasitic element adjacent to a lower portion of the radiator.

Abstract: An antenna structure according to an embodiment of the present disclosure includes an antenna unit array including a plurality of antenna units, and a parasitic element disposed to be adjacent to the antenna units and to be electrically and physically separated from the antenna units. Each of the antenna units includes a radiator, and a transmission line including a first transmission line and a second transmission line connected to the radiator in different directions. The parasitic element includes a first parasitic element disposed between the first transmission line and the second transmission line included in the same antenna unit, and a second parasitic element disposed between the first transmission line and the second transmission line included in different neighboring antenna units. The second parasitic element includes a branched portion including a first branched portion and a second branched portion bent in different directions.