| 摘要 |
PURPOSE:To realize the nondirectivity of the FM frequency band for a glass antenna for the rear window of a car in particular, by setting a separated auxiliary antenna element at the position near a main antenna element and separated from the main antenna element in terms of DC. CONSTITUTION:A main antenna line 24 having its feeding point at the side part of a glass plate 11 is set laterally at the upper part of a fog eliminating conductive heater 16 of the plate 11 which is fitted into the rear window of a car. At the same time, an auxiliary antenna line 25 which extends to the lateral direction of the plate 11 is set near the window frame at the upper part of the line 24 with a prescribed space secured to the line 24. Furthermore a main antenna element of a pattern which has a phase control antenna line 26 is provided to connect the lines 24 and 25. In such way, the conductor that takes charge of the secondary radiation of the antenna glass functions as a heater for elimination of fog and for the car body and a separated auxiliary antenna element respectively. Then the shape of the auxiliary antenna is freely selected to ensure the nondirectivity for the antenna glass. |
