A planar antenna, comprising: a ground area; a first planar radiation member opposing the ground area and providing a first resonant frequency, wherein the first planar radiation member comprises a first ground end, a feeding end, and an intermediate portion disposed between the first ground end and the feeding end, the first ground end is connected to the ground area, and the feeding end inputs signals; a second planar radiation member opposing the ground area and comprising a connecting portion and a first free end, wherein the connecting portion is connected to the intermediate portion, the first free end extends to one side of the first planar radiation member and is separated from the first ground end and feeding end by a first gap, and the feeding end, intermediate portion, connecting portion and first free end constitute a radiation path providing a second resonant frequency; and a third planar radiation member opposing the ground area and providing a third resonant frequency differing from the first and second resonant frequencies, wherein the third planar radiation member comprises a second ground end and a third free end, the second ground end is connected to the ground area, and the third free end is separated from the first and second planar radiation members (20; 30) by a third gap; characterised in that the second planar radiation member has a second free end which diverges from the first free end to the connecting portion and is separated from the connecting portion by a second gap, and in that the third planar radation member surrounds the first and second planar radiation members (20, 30). a ground area; a first planar radiation member opposing the ground area and providing a first resonant frequency, wherein the first planar radiation member comprises a first ground end, a feeding end, and an intermediate portion disposed between the first ground end and the feeding end, the first ground end is connected to the ground area, and the feeding end inputs signals; a second planar radiation member opposing the ground area and comprising a connecting portion and a first free end, wherein the connecting portion is connected to the intermediate portion, the first free end extends to one side of the first planar radiation member and is separated from the first ground end and feeding end by a first gap, and the feeding end, intermediate portion, connecting portion and first free end constitute a radiation path providing a second resonant frequency; and a third planar radiation member opposing the ground area and providing a third resonant frequency differing from the first and second resonant frequencies, wherein the third planar radiation member comprises a second ground end and a third free end, the second ground end is connected to the ground area, and the third free end is separated from the first and second planar radiation members (20; 30) by a third gap; characterised in that the second planar radiation member has a second free end which diverges from the first free end to the connecting portion and is separated from the connecting portion by a second gap, and in that the third planar radation member surrounds the first and second planar radiation members (20, 30).