An antenna, comprising: a feeding part, comprising a first dielectric substrate, wherein both surfaces of the first dielectric substrate are covered with a first metal layer, and an end of the first dielectric substrate is an input port of the feeding part; multiple parallel plated through holes perpendicular to the first metal layer disposed on the first dielectric substrate, and the multiple parallel plated-through holes are arranged along sides, except a side at which the input port is located, of the first dielectric substrate; a coupling groove is disposed in a part that is of the first dielectric substrate and that is close to an end opposite to the input port, a bottom of the coupling groove is the surface of the first dielectric substrate, a groove wall is a section of the first metal layer, and wherein the coupling groove is located inside a space formed by the multiple parallel plated-through holes, wherein the coupling groove has a rectangular shape with short sides and long sides, wherein the short sides are parallel to the side of the first dielectric substrate at which the input port is located; and a radiating part, comprising a second dielectric substrate, wherein both surface of the second dielectric substrate are covered with a second metal layer, wherein an end of the second dielectric substrate is a radiation port, and an end opposite to the radiation port is a coupling end; a row of parallel plated-through holes perpendicular to the second metal layer disposed on either side of the second dielectric substrate connecting the radiation port with the coupling end, wherein the coupling end connects the radiating part to the feeding part such that the coupling end completely covers the coupling groove, wherein a centerline of short sides of the coupling groove is superposed with a thickness centerline of the second dielectric substrate and wherein the thickness of the second dielectric substrate is greater than the length of the short sides of the coupling groove. a feeding part, comprising a first dielectric substrate, wherein both surfaces of the first dielectric substrate are covered with a first metal layer, and an end of the first dielectric substrate is an input port of the feeding part; multiple parallel plated through holes perpendicular to the first metal layer disposed on the first dielectric substrate, and the multiple parallel plated-through holes are arranged along sides, except a side at which the input port is located, of the first dielectric substrate; a coupling groove is disposed in a part that is of the first dielectric substrate and that is close to an end opposite to the input port, a bottom of the coupling groove is the surface of the first dielectric substrate, a groove wall is a section of the first metal layer, and wherein the coupling groove is located inside a space formed by the multiple parallel plated-through holes, wherein the coupling groove has a rectangular shape with short sides and long sides, wherein the short sides are parallel to the side of the first dielectric substrate at which the input port is located; and multiple parallel plated through holes perpendicular to the first metal layer disposed on the first dielectric substrate, and the multiple parallel plated-through holes are arranged along sides, except a side at which the input port is located, of the first dielectric substrate; a coupling groove is disposed in a part that is of the first dielectric substrate and that is close to an end opposite to the input port, a bottom of the coupling groove is the surface of the first dielectric substrate, a groove wall is a section of the first metal layer, and wherein the coupling groove is located inside a space formed by the multiple parallel plated-through holes, wherein the coupling groove has a rectangular shape with short sides and long sides, wherein the short sides are parallel to the side of the first dielectric substrate at which the input port is located; and a radiating part, comprising a second dielectric substrate, wherein both surface of the second dielectric substrate are covered with a second metal layer, wherein an end of the second dielectric substrate is a radiation port, and an end opposite to the radiation port is a coupling end; a row of parallel plated-through holes perpendicular to the second metal layer disposed on either side of the second dielectric substrate connecting the radiation port with the coupling end, wherein the coupling end connects the radiating part to the feeding part such that the coupling end completely covers the coupling groove, wherein a centerline of short sides of the coupling groove is superposed with a thickness centerline of the second dielectric substrate and wherein the thickness of the second dielectric substrate is greater than the length of the short sides of the coupling groove.