An antenna apparatus, comprising an antenna and a printed circuit board, wherein a feedpoint, a first grounding point and a second grounding point are disposed on the printed circuit board; the antenna is connected to the feedpoint and a part of the antenna extends linearly from the feedpoint, and the antenna comprises a first arm, a second arm and a third arm, each having a respective first end and a respective second end, and the first end of the third arm is floating; and the antenna apparatus further comprises: a first switch, wherein the first end of the first arm is connected to the first grounding point via the first switch, wherein when the first switch is closed, the first end of the first arm is connected to the first grounding point; and when the first switch is open, the first end of the first arm is floating; a second switch wherein the first end of the second arm is connected to the second grounding point via the second switch, wherein when the second switch is closed, the first end of the second arm is connected to the second grounding point; and when the second switch is open, the first end of the second arm is floating; characterized in that the first arm, the second arm and the third arm are arranged in the same plane extending parallel to the printed circuit board; and the first arm is folded in a U-shape comprising a long section and a short section that are parallel and wherein an extension section is connected perpendicularly to an open end of the short section extending outwardly of the U-shape and parallel to the part of the antenna extending linearly from the feedpoint and the first arm forms with the part of the antenna extending linearly from the feedpoint a folded L-shape, the second arm is formed in a L-shape and forms with the part of the antenna extending linearly from the feedpoint a U-shape and the third arm is formed in a L-shape and forms with the part of the antenna extending linearly from the feedpoint a L-shape, wherein the part of the antenna extending linearly from the feedpoint forms a part of each of the first arm, the second arm and the third arm, wherein the respective second ends of the first arm, the second arm and the third arm connect at the same point at the end of the part of the antenna extending linearly from the feedpoint, and wherein the first arm is arranged on a first side of the part of the antenna extending linearly from the feedpoint, the second arm is arranged on an opposite second side of the part of the antenna extending linearly form the feedpoint and the third arm extends to the first side. a first switch, wherein the first end of the first arm is connected to the first grounding point via the first switch, wherein when the first switch is closed, the first end of the first arm is connected to the first grounding point; and when the first switch is open, the first end of the first arm is floating; a second switch wherein the first end of the second arm is connected to the second grounding point via the second switch, wherein when the second switch is closed, the first end of the second arm is connected to the second grounding point; and when the second switch is open, the first end of the second arm is floating; characterized in that the first arm, the second arm and the third arm are arranged in the same plane extending parallel to the printed circuit board; and the first arm is folded in a U-shape comprising a long section and a short section that are parallel and wherein an extension section is connected perpendicularly to an open end of the short section extending outwardly of the U-shape and parallel to the part of the antenna extending linearly from the feedpoint and the first arm forms with the part of the antenna extending linearly from the feedpoint a folded L-shape, the second arm is formed in a L-shape and forms with the part of the antenna extending linearly from the feedpoint a U-shape and the third arm is formed in a L-shape and forms with the part of the antenna extending linearly from the feedpoint a L-shape, wherein the part of the antenna extending linearly from the feedpoint forms a part of each of the first arm, the second arm and the third arm, wherein the respective second ends of the first arm, the second arm and the third arm connect at the same point at the end of the part of the antenna extending linearly from the feedpoint, and wherein the first arm is arranged on a first side of the part of the antenna extending linearly from the feedpoint, the second arm is arranged on an opposite second side of the part of the antenna extending linearly form the feedpoint and the third arm extends to the first side.