Patent ID: 7386294

Claim:
A dedicated short-range communication on-vehicle apparatus mounted on a motor vehicle in a dedicated short-range communication system for an intelligent traffic system, comprising: an antenna having directivity in a predetermined direction; a radio module for performing transmission/reception of radio wave with road-side radio equipment by way of said antenna; a data processing unit for processing transmission/reception data transmitted/received by said radio module; and a box-like housing for housing therein said antenna, said radio module and said data processing unit in a unitary structure, wherein said box-like housing is adapted to be fixedly attached onto a windshield of the motor vehicle with a mounting plate being disposed on the radiation side of said antenna by means of an adhesive member, and wherein at least a radio wave aperture portion of said mounting plate is made of a radio wave transmissible material, said dedicated short-range communication on-vehicle apparatus further comprising a substrate on which at least one of said radio module and said data processing unit is mounted, wherein when said antenna is so set as to be transmissible in a direction orthogonal to said substrate, a substrate surface region located above an antenna transmissive planar region is greater than a substrate surface region located beneath said antenna transmissive planar region.