A foldable terminal device, comprising: a first feed source; and a first part and a second part that are foldable with respect to each other;; wherein the first part is configured with: a first antenna element, fed by the first feed source, and configured to operate in a first frequency band; and the second part is configured with: a second antenna element, coupled to the first antenna element for coupled feeding when the foldable terminal device is folded, wherein when the foldable terminal device is folded, the second antenna element is configured to operate in the first frequency band, and characterized in that the foldable terminal device further comprises: a third feed source, wherein the first antenna element is fed by the third feed source and configured to operate on a second frequency band; a first filtering element, electrically connected between the first feed source and the first antenna element, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source and the first antenna element, and configured to filter a signal of the first frequency band. a first feed source; and a first part and a second part that are foldable with respect to each other;; wherein the first part is configured with: a first antenna element, fed by the first feed source, and configured to operate in a first frequency band; and the second part is configured with: a second antenna element, coupled to the first antenna element for coupled feeding when the foldable terminal device is folded, wherein when the foldable terminal device is folded, the second antenna element is configured to operate in the first frequency band, and characterized in that the foldable terminal device further comprises: a third feed source, wherein the first antenna element is fed by the third feed source and configured to operate on a second frequency band; a first filtering element, electrically connected between the first feed source and the first antenna element, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source and the first antenna element, and configured to filter a signal of the first frequency band. a first antenna element, fed by the first feed source, and configured to operate in a first frequency band; and the second part is configured with: a second antenna element, coupled to the first antenna element for coupled feeding when the foldable terminal device is folded, wherein when the foldable terminal device is folded, the second antenna element is configured to operate in the first frequency band, and characterized in that the foldable terminal device further comprises: a third feed source, wherein the first antenna element is fed by the third feed source and configured to operate on a second frequency band; a first filtering element, electrically connected between the first feed source and the first antenna element, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source and the first antenna element, and configured to filter a signal of the first frequency band. a second antenna element, coupled to the first antenna element for coupled feeding when the foldable terminal device is folded, wherein when the foldable terminal device is folded, the second antenna element is configured to operate in the first frequency band, and characterized in that the foldable terminal device further comprises: a third feed source, wherein the first antenna element is fed by the third feed source and configured to operate on a second frequency band; a first filtering element, electrically connected between the first feed source and the first antenna element, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source and the first antenna element, and configured to filter a signal of the first frequency band. a third feed source, wherein the first antenna element is fed by the third feed source and configured to operate on a second frequency band; a first filtering element, electrically connected between the first feed source and the first antenna element, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source and the first antenna element, and configured to filter a signal of the first frequency band.