ON-VEHICLE ANTENNA DEVICE

摘要

PROBLEM TO BE SOLVED: To inhibit the performance deterioration of a circuit part while securing the design of a housing in an on-vehicle antenna device where a frequency of a used electromagnetic wave is high.SOLUTION: An on-vehicle antenna device 20 includes: a base 22 attached to a vehicle roof 11; a substrate 24 which has an antenna element part 26 and is erected on the base 22; a circuit part 28 which forms at least a part of a radio communication circuit electrically connected with the antenna element part 26 and is mounted on the substrate; and a housing 30 which is formed by a resin material and forms a protruding part of a vehicle outline. The substrate 24 and the circuit part 28 are housed in a space formed by the base 22 and the housing 30. A heat transmission path, which has heat conductivity higher than air, is formed between the circuit part 28 and the housing 30 without disposing the base 22 therebetween.