Antenna device and mobile terminal

An antenna device, comprising:

• a radio frequency transceiving circuit;
• a metal housing, an edge of the metal housing comprising an arc-shaped section, the metal housing being provided with at least one micro-seam band, the at least one micro-seam band comprising a first section and a second section, wherein the first section comprises an arc-shaped part, the arc-shaped part being spaced apart from the edge of the metal housing, and a shape of the arc-shaped part matching a shape of the arc-shaped section of the edge of the metal housing, the second section is placed on two ends of the first section and in straight lines towards lateral sides of the metal housing;
• and
• a matching circuit, by means of which the radio frequency transceiving circuit is electrically coupled to the metal housing, such that the metal housing is used as a radiating body of the antenna device, and the matching circuit performs impedance matching and balance matching between the radio frequency transceiving circuit and the metal housing,
• wherein the metal housing is rectangular, and the arc-shaped section is formed at a corner of the edge of the rectangular metal housing.

A mobile terminal, comprising an antenna device comprising:

• a radio frequency transceiving circuit;
• a matching circuit, electrically coupled to the radio frequency transceiving circuit;
• and
• a metal casing, an edge of the metal casing comprising an arc-shaped section, the metal casing being provided with at least one micro-seam band, the at least one micro-seam band comprising a first section and a second section, wherein the first section comprises an arc-shaped part, the arc-shaped part being spaced apart from the edge of the metal housing, and a shape of the arc-shaped part matching a shape of the arc-shaped section of the edge of the metal casing, the second section is placed on two ends of the first section and in straight lines towards lateral sides of the metal housing, wherein the radio frequency transceiving circuit is electrically coupled to the metal casing by means of the matching circuit, such that the metal casing is used as a radiator of the antenna device, the metal casing is grounded by means of a grounding wire, and the grounding wire is provided with an on-off switch configured to control the grounding wire,
• wherein the metal housing is rectangular, and the arc-shaped section is formed at a corner of the edge of the rectangular metal housing.