RADIO COMMUNICATION SYSTEM IN VEHICLE

PROBLEM TO BE SOLVED: To reduce the influence of the extrinsic electromagnetic waves of a radio communication system in a vehicle. SOLUTION: The radio communication system has a plurality of antennas 31a and an ECU31 connected to the antennas 31a through a coaxial cable 2 forms a parent module. An on vehicle apparatus 32 having an antenna 32a, a door ECU 33 having an antennas 33a, a car navigation device 34 having an antenna 34a form a child module. Communication between the parent module and the child module is effected in radio. Since the antenna of the parent module and the antenna of the child module are situated with the antennas opposed to each other, each antenna is situated near by, receiving sensitivity of a module on the receiving side can be lowered, and the influence of an extrinsic electromagnetic wave is reduced. COPYRIGHT: (C)2005,JPO&NCIPI