An antenna apparatus, comprising: a first feeding part, a second feeding part, a filter matching network, and a radiator, wherein the filter matching network comprises a first port, a second port, and a third port; the first feeding part is electrically connected to the first port, the second feeding part is electrically connected to the second port, and the radiator is electrically connected to the third port; and the first feeding part is configured to feed a low frequency signal and an intermediate frequency signal, the second feeding part is configured to feed a high frequency signal, a maximum frequency value of the low frequency signal and the intermediate frequency signal is 2170 MHz, a minimum frequency value of the high frequency signal is 2300 MHz, the low frequency signal, the intermediate frequency signal, and the high frequency signal are respectively fed in the filter matching network by using the first feeding part and the second feeding part, and the filter matching network is configured to improve isolation between the low frequency signal and the intermediate frequency signal, and the high frequency signal, wherein the antenna apparatus further comprises a main board and a frame of a mobile terminal, the mobile terminal comprises two opposite long sides and two opposite short sides, the frame comprises a first frame of the short side and a second frame of the long side, the radiator is disposed on the first frame, and the first feeding part and the second feeding part are disposed on the main board, wherein a first gap and a second gap are disposed on the first frame, so that the first frame is divided into a first segment, a second segment, and a third segment, the first segment and the third segment are respectively located on two sides of the second segment, the first segment and the third segment each extend to the second frame, and the filter matching network is electrically connected to the second segment, so that the second segment forms the radiator, wherein the second segment is further connected to a first ground segment, a first ground point is further disposed on the main board, and the first ground segment is connected to the first ground point, and wherein the second segment is further connected to an extension segment, one end of the extension segment is connected to one end that is of the second segment and that is away from the first ground segment, the other end of the extension segment is connected to the filter matching network, and the extension segment, the second segment, and the ground segment form a loop antenna. a first feeding part, a second feeding part, a filter matching network, and a radiator, wherein the filter matching network comprises a first port, a second port, and a third port; the first feeding part is electrically connected to the first port, the second feeding part is electrically connected to the second port, and the radiator is electrically connected to the third port; and the first feeding part is configured to feed a low frequency signal and an intermediate frequency signal, the second feeding part is configured to feed a high frequency signal, a maximum frequency value of the low frequency signal and the intermediate frequency signal is 2170 MHz, a minimum frequency value of the high frequency signal is 2300 MHz, the low frequency signal, the intermediate frequency signal, and the high frequency signal are respectively fed in the filter matching network by using the first feeding part and the second feeding part, and the filter matching network is configured to improve isolation between the low frequency signal and the intermediate frequency signal, and the high frequency signal, wherein the antenna apparatus further comprises a main board and a frame of a mobile terminal, the mobile terminal comprises two opposite long sides and two opposite short sides, the frame comprises a first frame of the short side and a second frame of the long side, the radiator is disposed on the first frame, and the first feeding part and the second feeding part are disposed on the main board, wherein a first gap and a second gap are disposed on the first frame, so that the first frame is divided into a first segment, a second segment, and a third segment, the first segment and the third segment are respectively located on two sides of the second segment, the first segment and the third segment each extend to the second frame, and the filter matching network is electrically connected to the second segment, so that the second segment forms the radiator, wherein the second segment is further connected to a first ground segment, a first ground point is further disposed on the main board, and the first ground segment is connected to the first ground point, and wherein the second segment is further connected to an extension segment, one end of the extension segment is connected to one end that is of the second segment and that is away from the first ground segment, the other end of the extension segment is connected to the filter matching network, and the extension segment, the second segment, and the ground segment form a loop antenna.