An antenna element comprising a combiner, a first antenna, a second antenna, a feed, a first connection circuit, a second connection circuit (30a, 30b), a first ground circuit, and a second ground circuit (30c, 30d), wherein: the combiner has a first input terminal electrically connected to a contact of the first antenna via the first connection circuit, a second input terminal electrically connected to a contact (31, 32) of the second antenna via the second connection circuit, and an output terminal electrically connected to the feed; the first ground circuit is electrically connected between another contact of the first antenna and ground; the second ground circuit is electrically connected between another contact (35, 36) of the second antenna and ground; the first ground circuit comprises a first switch electrically connected between the first antenna and ground, whereby the first antenna is arranged to cover different frequency bands by switching an on-off state of the first switch; the second connection circuit comprises a first connection sub-circuit and a second connection sub-circuit which are electrically connected in parallel between the second antenna and the combiner; the first connection sub-circuit comprises a second switch electrically connected between the second antenna and the second input terminal, whereby the second antenna is arranged to cover different frequency bands by switching an on-off state of the second switch; the second ground circuit comprises a first ground sub-circuit and a second ground sub-circuit which are electrically connected in parallel, wherein the first ground sub-circuit comprises a second ground terminal and a second inductor, wherein the second ground terminal, the second inductor, and the second antenna are electrically connected in series; and the second ground sub-circuit comprises the second ground terminal, a third switch, and a third inductor, wherein the second ground terminal, the third switch, the third inductor, and the second antenna are electrically connected in series; and the second antenna is selectively operable in multiple frequency bands by switching on-off states of the second switch and the third switch. the combiner has a first input terminal electrically connected to a contact of the first antenna via the first connection circuit, a second input terminal electrically connected to a contact (31, 32) of the second antenna via the second connection circuit, and an output terminal electrically connected to the feed; the first ground circuit is electrically connected between another contact of the first antenna and ground; the second ground circuit is electrically connected between another contact (35, 36) of the second antenna and ground; the first ground circuit comprises a first switch electrically connected between the first antenna and ground, whereby the first antenna is arranged to cover different frequency bands by switching an on-off state of the first switch; the second connection circuit comprises a first connection sub-circuit and a second connection sub-circuit which are electrically connected in parallel between the second antenna and the combiner; the first connection sub-circuit comprises a second switch electrically connected between the second antenna and the second input terminal, whereby the second antenna is arranged to cover different frequency bands by switching an on-off state of the second switch; the second ground circuit comprises a first ground sub-circuit and a second ground sub-circuit which are electrically connected in parallel, wherein the first ground sub-circuit comprises a second ground terminal and a second inductor, wherein the second ground terminal, the second inductor, and the second antenna are electrically connected in series; and the second ground sub-circuit comprises the second ground terminal, a third switch, and a third inductor, wherein the second ground terminal, the third switch, the third inductor, and the second antenna are electrically connected in series; and the first ground sub-circuit comprises a second ground terminal and a second inductor, wherein the second ground terminal, the second inductor, and the second antenna are electrically connected in series; and the second ground sub-circuit comprises the second ground terminal, a third switch, and a third inductor, wherein the second ground terminal, the third switch, the third inductor, and the second antenna are electrically connected in series; and the second antenna is selectively operable in multiple frequency bands by switching on-off states of the second switch and the third switch.