A vehicle-body-embedded antenna device includes an antenna element, a circuit board, a coil and a ground bracket. The antenna element of a grounded type has an antenna capacitance adapted to function as a capacitive antenna that supports a first frequency band, and main polarization thereof is polarization substantially parallel to the roof surface. The coil is placed on the circuit board and connected to the power feeding part to which the antenna element is connected for making the antenna element to have an antenna length supporting a second frequency band. The ground bracket is directly grounded to a conductive member of the vehicle body which is provided at an angle different from an angle of the roof surface for improving polarization sensitivity of the antenna element substantially perpendicular to the roof surface.
Vehicle-body-embedded antenna device
2022-01-25
Patent
Elektronische Ressource
Englisch