Vehicle communication apparatus

A vehicle communication apparatus comprising:

• an antenna module;
• a wireless communication device placed physically apart from the antenna module;
• a first communication cable connecting the antenna module with the wireless communication device;
• and
• a second communication cable connecting the antenna module with the wireless communication device, wherein
• the antenna module includes a first antenna and a second antenna,
• the wireless communication device includes
• a first antenna-connecting sending portion connected with the first antenna through the first communication cable, and outputting a sending signal radiated from the first antenna as a sending wave,
• a second antenna-connecting receiving portion connected with the second antenna through the second communication cable, and receiving the sending wave radiated from the first antenna with the second antenna as a receiving signal,
• an adjustment portion adjusting a sending power of the sending wave radiated from the first antenna,
• a memory storing in advance a coupling amount representing an attenuation level of an electric wave between the first antenna and the second antenna, and
• a loss amount calculation portion calculating a loss amount by the first communication cable based on an output power when the first antenna-connecting sending portion outputs the sending signal to the first communication cable, an input power when the receiving signal is inputted to the second antenna-connecting receiving portion, and the coupling amount stored by the memory, and
• the adjustment portion adjusts the sending power of the sending wave radiated from the first antenna based on the loss amount calculated by the loss amount calculation portion, and equalizes the sending power with a reference power.