A communications device, comprising: a metal carrier, wherein the metal carrier has a mounting plane, and at least one mounting area is defined on the mounting plane; and an antenna element disposed in each mounting area, wherein the antenna element comprises: a radiation structure and a feed structure connected to the radiation structure, the feed structure is fastened to the mounting plane, and a point at which the feed structure is connected to the mounting plane is a feedpoint; wherein the mounting area is an area of the mounting plane in which the mounting plane intersects a circle centered at the feedpoint of the antenna element in the mounting area and whose radius R ANT does not exceed a specified radius; wherein the mounting area comprises the projection of the bottom surface of the area occupied by the radiation structure onto the mounting plane when viewed from above the mounting plane, wherein a boundary line of the mounting area comprises a vertex A i of the mounting plane, a distance R C from the feedpoint of the antenna element in the mounting area to the vertex is less than or equal to a specified distance, wherein the specified distance is 0.12 λ 1, the specified radius is 0.25 λ 1, and λ 1 is a wavelength corresponding to a minimum operating frequency of the antenna element, wherein the mounting plane is polygonal, and characterized in that: the vertex is Ai, two sides of the mounting plane intersecting at the vertex are respectively A i-1 A i and AiAi+i, the feedpoint is F, the distance Rc is a length of FAi, and the mounting area is BAi-AiC-arc, or the vertex Ai has a structure of an oblique or round chamfer, the vertex Ai is an intersection of extension lines of the two sides A i-1 A i and AiAi+i, the distance Rc is the distance from the feedpoint to a point at which a connection line between the intersection of extension lines of the two sides Ai-iAi and AiAi+i and the feedpoint intersects the chamfer, and the mounting area is BAi-AiC-arc, where B and C are points on the two sides Ai-iAi and AiAi+i, respectively where the circle intersects the two sides Ai-iAi and AiAi+i, and arc is the arc of the circle from point C to point B inside the mounting plane. an antenna element disposed in each mounting area, wherein the antenna element comprises: a radiation structure and a feed structure connected to the radiation structure, the feed structure is fastened to the mounting plane, and a point at which the feed structure is connected to the mounting plane is a feedpoint; wherein the mounting area is an area of the mounting plane in which the mounting plane intersects a circle centered at the feedpoint of the antenna element in the mounting area and whose radius R ANT does not exceed a specified radius; wherein the mounting area comprises the projection of the bottom surface of the area occupied by the radiation structure onto the mounting plane when viewed from above the mounting plane, wherein a boundary line of the mounting area comprises a vertex A i of the mounting plane, a distance R C from the feedpoint of the antenna element in the mounting area to the vertex is less than or equal to a specified distance, wherein the specified distance is 0.12 λ 1, the specified radius is 0.25 λ 1, and λ 1 is a wavelength corresponding to a minimum operating frequency of the antenna element, wherein the mounting plane is polygonal, and characterized in that: the vertex is Ai, two sides of the mounting plane intersecting at the vertex are respectively A i-1 A i and AiAi+i, the feedpoint is F, the distance Rc is a length of FAi, and the mounting area is BAi-AiC-arc, or the vertex Ai has a structure of an oblique or round chamfer, the vertex Ai is an intersection of extension lines of the two sides A i-1 A i and AiAi+i, the distance Rc is the distance from the feedpoint to a point at which a connection line between the intersection of extension lines of the two sides Ai-iAi and AiAi+i and the feedpoint intersects the chamfer, and the mounting area is BAi-AiC-arc, where B and C are points on the two sides Ai-iAi and AiAi+i, respectively where the circle intersects the two sides Ai-iAi and AiAi+i, and arc is the arc of the circle from point C to point B inside the mounting plane. the vertex is Ai, two sides of the mounting plane intersecting at the vertex are respectively A i-1 A i and AiAi+i, the feedpoint is F, the distance Rc is a length of FAi, and the mounting area is BAi-AiC-arc, or the vertex Ai has a structure of an oblique or round chamfer, the vertex Ai is an intersection of extension lines of the two sides A i-1 A i and AiAi+i, the distance Rc is the distance from the feedpoint to a point at which a connection line between the intersection of extension lines of the two sides Ai-iAi and AiAi+i and the feedpoint intersects the chamfer, and the mounting area is BAi-AiC-arc, where B and C are points on the two sides Ai-iAi and AiAi+i, respectively where the circle intersects the two sides Ai-iAi and AiAi+i, and arc is the arc of the circle from point C to point B inside the mounting plane.