In-vehicle communication apparatus

An in-vehicle communication apparatus comprising:

• an antenna module;
• and
• a wireless communication device that is physically separated from the antenna module and connected to the antenna module through a coaxial cable,
• wherein:
• the antenna module includes
• an antenna, and
• a transmission amplifier of the antenna;
• the wireless communication device includes
• a power generation portion that supplies a power driving the antenna module,
• a signal generation portion that generates a transmission signal to be transmitted from the antenna,
• a power superimposition portion that superimposes the transmission signal generated by the signal generation portion on the power supplied from the power generation portion, and transmits a superimposed power to the transmission amplifier through the coaxial cable,
• a current detection portion that detects a consumption current value of the transmission amplifier from the power that is supplied from the power generation portion to the transmission amplifier,
• a correspondence relationship hold portion that holds a correspondence relationship between the consumption current value of the transmission amplifier and an output power value of the transmission amplifier in advance, and
• a regulation portion that adjusts the transmission signal generated by the signal generation portion to maintain the output power value of the transmission amplifier at a predetermined power value, the output power value being obtained with reference to the correspondence relationship held in the correspondence relationship hold portion based on the consumption current value of the transmission amplifier detected by the current detection portion.