Vehicle-mounted antenna substrate unit

摘要

The present invention is directed to achieving a favorable grounding state in a vehicle-mounted antenna. One end of a bent antenna element 22 is connected to an inner conductor of a coaxial cable 14 via a wiring conductor pattern of a substrate 12. An outer conductor of the coaxial cable 14 is connected to a front grounding conductor pattern of the substrate 12. In the substrate 12, a plate capacitor is formed by the front grounding conductor pattern, a rear grounding conductor pattern, and a dielectric plate sandwiched between these grounding conductor patterns. The outer conductor 52 of the coaxial cable 14 is electrically connected to one end of a grounding bracket 20 via the plate capacitor. A tip portion 24 of the grounding bracket 20 is secured to a vehicle body by means of a bolt 26 and is electrically connected to the vehicle body.

主权项

1. A vehicle-mounted antenna substrate unit, comprising:
a substrate having an antenna element connected thereto and including a grounding conductor plate; a linear conductor drawn out from the substrate and at least partly secured to a conductor component of a vehicle; and a capacitor provided between the grounding conductor plate and the linear conductor.