Communication device, communication method, and communication system

1. A communication device comprising:

a transmission circuitry configured to

convert a frequency of a baseband signal that is output by a first electronic device into a modulated signal having a frequency that is higher than the frequency of the baseband signal, and

transmit the modulated signal using a waveguide as a transmission path;

a detection target circuitry corresponding to a mechanism included in a second electronic device that receives the baseband signal that is output by the first electronic device, the detection target circuitry configured to

connect to the first electronic device, and

emulate the mechanism included in the second electronic device to cause the first electronic device to detect a connection between the first electronic device and the second electronic device;

a control circuitry configured to control a connection between the detection target circuitry and the first electronic device according to a connection state between the first electronic device and the second electronic device; and

a connection detection circuitry configured to detect the connection between the first electronic device and the second electronic device,

wherein the control circuitry is further configured to

control the detection target circuitry to connect to the first electronic device when the connection between the first electronic device and the second electronic device is detected by the connection detection circuitry, and

control the detection target circuitry to disconnect from the first electronic device when a disconnection between the first electronic device and the second electronic device is detected by the connection detection circuitry.

2. The communication device according to claim 1 , wherein the detection target circuitry is configured as a common mode impedance.

3. The communication device according to claim 1 , wherein the modulated signal is a signal of a millimeter wave band.

4. A communication device comprising:

a transmission circuitry configured to transmit a modulated signal obtained by performing frequency conversion to convert a baseband signal that is output by a first electronic device into the modulated signal with a higher frequency band than the baseband signal, using a waveguide as a transmission path; and

a detection target circuitry corresponding to a mechanism included in a second electronic device that receives the baseband signal that is output by the first electronic device, the detection target circuitry configured to

connect to the first electronic device, and

cause detection of a connection between the first electronic device and the second electronic device;

a control circuitry configured to control a connection between the detection target circuitry and the first electronic device according to a connection state between the first electronic device and the second electronic device; and

a connection detection circuitry configured to detect the connection between the first electronic device and the second electronic device,

wherein the control circuitry is further configured to

connect the detection target circuitry to the first electronic device when the connection between the first electronic device and the second electronic device is detected, and

disconnect the detection target circuitry from the first electronic device when disconnection between the first electronic device and the second electronic device is detected, and

wherein the connection detection circuitry is further configured to

detect power of a second modulated signal transmitted from a second communication device that transmits the second modulated signal obtained by performing a second frequency conversion on a second baseband signal that is output by the second electronic device, and

detect the connection between the first electronic device and the second electronic device based on the power of the second modulated signal.

5. The communication device according to claim 4 , further comprising:

a reception circuitry configured to

receive the second modulated signal transmitted from the second communication device, and

perform a third frequency conversion to convert the second modulated signal into a third baseband signal,

wherein the connection detection circuitry is further configured to detect the power of the second modulated signal using the third baseband signal obtained by performing the third frequency conversion on the second modulated signal transmitted from the second communication device.

6. The communication device according to claim 5 , wherein the connection detection circuitry is further configured to detect a direct current (DC) offset of the second baseband signal obtained by performing the third frequency conversion on the second modulated signal transmitted from the second communication device as the power of the second modulated signal.

7. The communication device according to claim 6 ,

wherein the reception circuitry is further configured to output a differential signal as the second baseband signal obtained by performing the third frequency conversion on the second modulated signal transmitted from the second communication device, and

wherein the connection detection circuitry is further configured to detect a difference in the DC offset of the differential signal as the power of the second modulated signal.

8. The communication device according to claim 4 , wherein the connection detection circuitry is further configured to

determine that the first electronic device and the second electronic device are connected when the power of the second modulated signal is equal to or greater than a first threshold value, and

determine that the first electronic device and the second electronic device are disconnected when the power of the second modulated signal is equal to or less than a second threshold value less than the first threshold value.

9. The communication device according to claim 4 , wherein the detection target circuitry is configured as a common mode impedance.

10. The communication device according to claim 4 , wherein the modulated signal is a signal of a millimeter wave band.

11. A communication method comprising:

connecting a communication device to a first electronic device, the communication device including a detection target circuitry corresponding to a mechanism included in a second electronic device;

detecting, with a connection detection circuitry, a connection between the first electronic device and the second electronic device;

controlling, with a control circuitry, the detection target circuitry to connect to the first electronic device when the connection between the first electronic device and the second electronic device is detected by the connection detection circuitry;

emulating, with the detection target circuitry, the mechanism included in the second electronic device to cause the first electronic device to detect the connection between the first electronic device and the second electronic device;

converting, with a transmission circuitry of the communication device, a frequency of a baseband signal that is output by the first electronic device into a modulated signal having a frequency that is higher than the frequency of the baseband signal; and

transmitting, with the transmission circuitry, the modulated signal to the second electronic device using a waveguide as a transmission path.

12. A communication system comprising:

a first electronic device; and

a communication device connected to the first electronic device, the communication device including

a transmission circuitry configured to

convert a frequency of a first baseband signal that is output by the first electronic device into a first modulated signal having a frequency that is higher than the frequency of the first baseband signal, and

transmit the first modulated signal using a waveguide as a transmission path;

a detection target circuitry corresponding to a mechanism included in a second electronic device that receives the first baseband signal that is output by the first electronic device, the detection target circuitry configured to

connect to the first electronic device, and

emulate the mechanism included in the second electronic device to cause the first electronic device to detect a connection between the first electronic device and the second electronic device; and

a reception circuitry configured to

receive a second modulated signal transmitted from a second communication device, wherein the second modulated signal is obtained by performing a second frequency conversion on a second baseband signal output by the second electronic device, and

convert the second modulated signal into a second baseband signal;

a control circuitry configured to control a connection between the detection target circuitry and the first electronic device according to a connection state between the first electronic device and the second electronic device; and

a connection detection circuitry configured to detect the connection between the first electronic device and the second electronic device,

wherein the control circuitry is further configured to

control the detection target circuitry to connect to the first electronic device when the connection between the first electronic device and the second electronic device is detected by the connection detection circuitry, and

control the detection target circuitry to disconnect from the first electronic device when a disconnection between the first electronic device and the second electronic device is detected by the connection detection circuitry.

13. A communication system comprising:

a first electronic device; and

a communication device connected to the first electronic device, the communication device including

a transmission circuitry configured to transmit a first modulated signal obtained by performing a first frequency conversion to convert a first baseband signal that is output by the first electronic device into the first modulated signal with a higher frequency band than the first baseband signal, using a waveguide as a transmission path;

a detection target circuitry corresponding to a mechanism included in a second electronic device that receives the first baseband signal that is output by the first electronic device, the detection target circuitry configured to

connect to the first electronic device, and

cause detection of a connection between the first electronic device and the second electronic device;

a reception circuitry configured to

receive a second modulated signal transmitted from a second communication device that transmits the second modulated signal obtained by performing a second frequency conversion on a second baseband signal output by the second electronic device, and

perform a third frequency conversion to convert the second modulated signal into a second baseband signal;

a control circuitry configured to control a connection between the detection target circuitry and the first electronic device according to a connection state between the first electronic device and the second electronic device; and

a connection detection circuitry configured to detect the connection between the first electronic device and the second electronic device,

wherein the control circuitry is further configured to

connect the detection target circuitry to the first electronic device when the connection between the first electronic device and the second electronic device is detected by the connection detection circuitry, and

disconnect the detection target circuitry from the first electronic device when disconnection between the first electronic device and the second electronic device is detected by the connection detection circuitry, and

wherein the connection detection circuitry is further configured to

detect power of the second modulated signal transmitted from the second communication device that transmits the second modulated signal obtained by performing the second frequency conversion on the second baseband signal that is output by the second electronic device, and

detect the connection between the first electronic device and the second electronic device based on the power of the second modulated signal.

14. The communication system according to claim 13 , wherein the connection detection circuitry is further configured to detect a direct current (DC) offset of the second baseband signal obtained by performing the third frequency conversion on the second modulated signal transmitted from the second communication device as the power of the second modulated signal.

15. The communication system according to claim 14 ,

wherein the reception circuitry is further configured to output a differential signal as the second baseband signal obtained by performing the third frequency conversion on the second modulated signal transmitted from the second communication device, and

wherein the connection detection circuitry is further configured to detect a difference in the DC offset of the differential signal as the power of the second modulated signal.

16. The communication system according to claim 13 , wherein the connection detection circuitry is further configured to

determine that the first electronic device and the second electronic device are connected when the power of the second modulated signal is equal to or greater than a first threshold value, and

determine that the first electronic device and the second electronic device are disconnected when the power of the second modulated signal is equal to or less than a second threshold value less than the first threshold value.

17. The communication system according to claim 13 , wherein the detection target circuitry is configured as a common mode impedance.

18. The communication system according to claim 13 , wherein the first modulated signal is a signal of a millimeter wave band.

19. The communication method according to claim 11 , further comprising controlling, with the control circuitry, the detection target circuitry to disconnect from the first electronic device when the connection between the first electronic device and the second electronic device is not detected by the connection detection circuitry.

20. The communication method according to claim 11 , wherein the detection target circuitry is configured as a common mode impedance.

21. The communication method according to claim 11 , wherein the modulated signal is a signal of a millimeter wave band.

22. The communication system according to claim 12 , wherein the detection target circuitry is configured as a common mode impedance.

23. The communication system according to claim 12 , wherein the first modulated signal is a signal of a millimeter wave band.