MOBILE ANTENNA FEED SYSTEM

摘要

Moisture-insensitive system adapted to couple radio frequency energy at a low impedance from a matched two conductor transmission line (33) through a vehicle windshield (27) and to an antenna in a manner which minimizes stray radio frequency radiation within the passenger compartment of the vehicle. The system includes two pairs of conducting plates, one pair mounted on each side of the windshield, each pair opposite the other pair. A coaxial feed line (33) is coupled directly to the inside pair of plates (23, 25) thereby presenting a low impedance across the outside pair of plates (29, 31). A matching circuit (57, 59) is connected across the outside pair of plates and couples the radio frequency energy to a full-size, unloaded antenna element.