Patent ID: 6064345
Filing Date: 2000-05-16
Classification: H01Q

Abstract:
A glass antenna device for an automobile comprising:a rear window glass sheet;an electric heating type defogger formed on the glass sheet, which is provided with heater strips and positive and negative bus bars for feeding a current to the heater strips; anda coil having an end which is connected to the positive bus bar and another end which is connected a positive terminal of a d.c. power source for the defogger;wherein the negative bus bar is physically and directly grounded to the automobile body;antenna conductors are provided in a region in the rear window glass sheet other than the region where the defogger is formed;an antenna conductor element of the antenna conductors extends substantially parallel to the heater strips of the defogger, is more than half in length than a width of the rear window glass sheet, and is located in the range of 15 mm-50 mm apart from an end heating strip of the heating strips of the defogger nearest to the antenna conductor element;said coil has an inductance value in the range of 0.5-10 .mu.H; anda capacitance between said antenna conductors and said defogger is 50 pf or less.