| 摘要 |
PURPOSE:To prevent output circuits connected to two different points of antenna elements from affecting on each directivity, by providing the antenna elements on the upper or lower part of a conductor wire group for heating on a front window glass of a car. CONSTITUTION:Antenna elements 10 are provided on the upper part of a heating conductor wire group 2 of a window glass 1, and an output is given to an antenna switching circuit 17 from the 1st and 2nd feeding points 12 and 14. The 1st feeding point 12 is provided at the upper folding part of a main antenna 11a. The 2nd feeding point 14 or 14' is provided at a position adjacent to the fooding point 12 (or a side opposite to the window glass 1). The 2nd feeding point 14 is connected to an open end A or B at the middle or lower stage of the E- shaped main antenna 11a, or an open end C of a lower auxiliary antenna 11d. The feeding point 14' is connected to a middle point D of a joint of three parallel wires constituting the main antenna 11a. |
