Signal transmission device, electronic device, and signal transmission method

1. A signal transmission device comprising:

a transmitting device that transmits a transmission subject signal as a wireless signal;

a first waveguide through which the transmission subject signal passes, the first waveguide being fixed to the transmitting device, and the transmission subject signal being outputted at a first edge of the first waveguide;

a receiving device that receives the wireless signal of the transmission subject signal transmitted from the transmitting device;

a second waveguide through which the transmission subject signal passes, the second waveguide being fixed to the receiving device, and the transmission subject signal being inputted at a second edge of the second waveguide; and

a third waveguide through which the transmission subject signal passes, the transmission subject signal being inputted at a third edge of the third waveguide and outputted at a fourth edge of the third waveguide, wherein

the transmission subject signal is transmitted between the transmitting device and the receiving device in a state where the first edge of the first waveguide faces the third edge of the third waveguide, and the fourth edge of the third waveguide faces the second edge of the second waveguide,

the third edge of the third waveguide does not extend beyond the first edge of the first waveguide in a first direction so that the first waveguide and the third waveguide do not overlap with each other in a second direction perpendicular to the first direction, and

the fourth edge of the third waveguide does not extend beyond the second edge of the second waveguide in the first direction so that the second waveguide and the third waveguide do not overlap with each other in the second direction.

2. The signal transmission device according to claim 1 ,

wherein one of the first and second waveguides includes an antenna which is disposed on a side thereof opposite to a side associated with the other waveguide, and which is electromagnetically coupled with a high-frequency signal transmission path through which high-frequency signals are transmitted, and

wherein at least the antenna is integrated with the one waveguide.

3. The signal transmission device according to claim 2 ,

wherein the antenna and the one waveguide are formed in the same circuit substrate.

4. The signal transmission device according to claim 3 ,

wherein a conductor that forms the one waveguide is fixed to a surface of the circuit substrate close to the other waveguide of the first and second waveguides.

5. The signal transmission device according to claim 3 ,

wherein the one waveguide is formed in the circuit substrate so as to extend in the thickness direction thereof.

6. The signal transmission device according to claim 2 ,

wherein the high-frequency signal transmission path, the antenna, and the one waveguide are integrated with each other.

7. The signal transmission device according to claim 6 ,

wherein the high-frequency signal transmission path, the antenna, and the one waveguide are formed in the same circuit substrate.

8. The signal transmission device according to claim 1 ,

further comprising an alignment structure that performs alignment of the first waveguide, the second waveguide, and the third waveguide such that the first edge of the first waveguide faces the third edge of the third waveguide, and the fourth edge of the third waveguide faces the second edge of the second waveguide.

9. The signal transmission device according to claim 8 ,

wherein the alignment structure has a structure that causes radio waves to be transmitted while confining the radio waves in a transmission path.

10. The signal transmission device according to claim 9 ,

wherein a dielectric material having a property capable of transmitting the radio waves is filled in the alignment structure.

11. The signal transmission device according to claim 8 ,

wherein the alignment structure has a structure that defines an attachment state between the first waveguide, the second waveguide, and the third waveguide.

12. The signal transmission device according to claim 1 ,

wherein a dielectric material having a property capable of transmitting radio waves is filled in at least one of the first waveguide, the second waveguide, and the third waveguide.

13. The signal transmission device according to claim 1 , wherein the first direction is a direction connecting the transmitting device and the receiving device.

14. A signal transmission method in which signal transmission of a transmission subject signal as a wireless signal is performed between a transmitting device and a receiving device, the method comprising:

providing a first waveguide in the first electronic device, the transmission subject signal passing through the first waveguide, the first waveguide being fixed to the transmitting device, and the transmission subject signal being outputted at a first edge of the first waveguide;

providing a second waveguide in the second electronic device, the transmission subject signal passing through the second waveguide, the second waveguide being fixed to the receiving device, and the transmission subject signal being inputted at a second edge of the second waveguide;

providing a third waveguide, the transmission subject signal passing through the third waveguide, the transmission subject signal being inputted at a third edge of the third waveguide and outputted at a fourth edge of the third waveguide, and

transmitting the transmission subject signal between the first and second electronic devices in a state where the first edge of the first waveguide faces the third edge of the third waveguide, and the fourth edge of the third waveguide faces the second edge of the second waveguide, wherein

the third edge of the third waveguide does not extend beyond the first edge of the first waveguide in a first direction so that the first waveguide and the third waveguide do not overlap with each other in a second direction perpendicular to the first direction, and

the fourth edge of the third waveguide does not extend beyond the second edge of the second waveguide in the first direction so that the second waveguide and the third waveguide do not overlap with each other in the second direction.