| 摘要 |
PURPOSE:To reduce the change of the reception characteristics due to wiring of a feeder line, by providing the feeders line along a metallic window frame with a car body, in the car provided with antenna elements on a window glass. CONSTITUTION:The 2nd antenna elements 11 are provided at the lower part of a heating conductor group 2 of a front window glass 1 of a car, and the reception output of the elements 11 is led to a feeding terminal at the lower end of the window glass 1. The 1st antenna elements 10 are provided at the upper part of the group 2 and an output of the elements 10 is given to a feeding terminal 12 located in the vicinity of the feeding point 14 with a feeder line 18. The feeder line 18 is provided along a metallic window frame (connected to a car body being ground potential). Outputs from both the feeding terminals are given to an antenna switching circuit to select the antenna elements with better electromagnetic wave reception. |
