Patent ID: 11876547
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A vehicle-mounted communication device that is to be mounted on a vehicle, comprising:
a wireless communication unit that transmits an RF (Radio Frequency) signal that includes data, and is capable of changing a communication method;
an acquisition unit that acquires state information that indicates a state of the vehicle; and
a control unit that performs switching control to change the communication method based on the state information acquired by the acquisition unit,
wherein the wireless communication unit includes
a multiband antenna with a variable resonance frequency, and
a wireless signal processing unit that superimposes RF signals that conform to a plurality of communication methods and outputs the RF signals, and
a plurality of filters that respectively correspond to the plurality of communication methods and receive the superimposed and output RF signals, and
a combining circuit that combines the RF signal that has passed through the filters and outputs the combined signals to the multiband antenna, and
the multiband antenna changes the resonance frequency according to the communication method indicated by the control information received from the control unit and outputs the RF signal corresponding to the communication method.