Electronic device

1. An electronic device, comprising:

a touch screen;

a first back cover, comprising a frame and a cover body;

a transmitting antenna, adjacent to an edge of the touch screen and having a feeding point for receiving a feeding signal; and

a receiving antenna, adjacent to the cover body of the first back cover, and electrically connected to a ground plane, wherein the receiving antenna and the transmitting antenna are spaced apart by a coupling distance, and a signal from the receiving antenna is transmitted to the feeding point through the coupling distance and the transmitting antenna.

2. The electronic device as claimed in claim 1 , wherein the frame and the cover body are made of a non-conductive material, and the receiving antenna comprises:

a first radiation element, disposed at an inner side of the cover body, and electrically connected to the ground plane; and

a second radiation element, disposed at an inner side of the frame, and electrically connected to the first radiation element, wherein the second radiation element and the transmitting antenna are spaced apart by the coupling distance.

3. The electronic device as claimed in claim 2 , further comprising:

a substrate, disposed between the first back cover and the touch screen, and the ground plane being disposed on the substrate; and

a conductive elastic piece, disposed on the ground plane, and the first radiation element being electrically connected to the ground plane through the conductive elastic piece.

4. The electronic device as claimed in claim 2 , wherein an orthogonal projection of the first radiation element on the first back cover is partially overlapped with an orthogonal projection of the transmitting antenna on the first back cover.

5. The electronic device as claimed in claim 4 , further comprising:

a second back cover, fixed outside the first back cover, and made of a metal material, wherein an orthogonal projection of the second back cover on the first back cover is not overlapped with an orthogonal projection of the receiving antenna on the first back cover, and the orthogonal projection of the second back cover on the first back cover is not overlapped with the orthogonal projection of the transmitting antenna on the first back cover.

6. The electronic device as claimed in claim 1 , further comprising:

a second back cover, fixed outside the first back cover, wherein the second back cover and the frame are made of a metal material, the cover body is made of a non-conductive material, the frame has a gap, and the receiving antenna is composed of a part of the second back cover and a part of the frame.

7. The electronic device as claimed in claim 6 , further comprising:

a substrate, disposed between the first back cover and the touch screen, and the ground plane being configured on the substrate; and

a conductive elastic piece, disposed on the ground plane, and the second back cover being electrically connected to the ground plane through the conductive elastic piece.

8. The electronic device as claimed in claim 1 , further comprising:

a battery, disposed between the first back cover and the touch screen.

9. The electronic device as claimed in claim 1 , wherein the transmitting antenna and the receiving antenna form a multi-band antenna with a single feeding structure.

10. The electronic device as claimed in claim 9 , wherein the multi-band antenna emits an electromagnetic wave in a first frequency band through the transmitting antenna, and receives an electromagnetic wave in a second frequency band through the receiving antenna.

11. An electronic device, comprising:

a touch screen;

a first back cover, comprising a frame and a cover body;

a transmitting antenna, adjacent to an edge of the touch screen and having a feeding point for receiving a feeding signal; and

a receiving antenna, adjacent to the cover body of the first back cover, and electrically connected to a ground plane, wherein the receiving antenna and the transmitting antenna are spaced apart by a coupling distance, and a signal from the receiving antenna is transmitted to the feeding point through the coupling distance and the transmitting antenna, and

wherein the frame and the cover body are made of a non-conductive material, and the receiving antenna comprises:

a first radiation element, disposed at an inner side of the cover body, and electrically connected to the ground plane; and

a second radiation element, disposed at an inner side of the frame, and electrically connected to the first radiation element, wherein the second radiation element and the transmitting antenna are spaced apart by the coupling distance.

12. An electronic device, comprising:

a touch screen;

a first back cover, comprising a frame and a cover body;

a transmitting antenna, adjacent to an edge of the touch screen and having a feeding point for receiving a feeding signal;

a receiving antenna, adjacent to the cover body of the first back cover, and electrically connected to a ground plane, wherein the receiving antenna and the transmitting antenna are spaced apart by a coupling distance, and a signal from the receiving antenna is transmitted to the feeding point through the coupling distance and the transmitting antenna; and

a second back cover, fixed outside the first back cover, wherein the second back cover and the frame are made of a metal material, the cover body is made of a non-conductive material, the frame has a gap, and the receiving antenna is composed of a part of the second back cover and a part of the frame.