| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass antenna system for a vehicle and the like in which excellent reception performance can be obtained for radio waves of a long wave broadcasting band regardless of whether a defogger is electrified or not, while maintaining the miniaturization of a choke coil and suppressing a reduction change of a parallel resonant frequency caused by the heating of the choke coil. SOLUTION: The glass antenna system for the vehicle includes a defogger comprising a plurality of hot wires 13 formed on the surface of window glass 11 for a vehicle window and busbars 14a, 14b connected to the hot wires 13, the defogger is also operable as an antenna element, and the two busbars include a power feeding busbar 14a connected through a choke coil 16 to a power source 17 and a ground busbar 14b grounded through the choke coil. The system is configured to comprise a capacitor 19 for resonant frequency correction which is thermally coupled with the choke coil and of which the value of capacitance is decreased by a temperature rise. COPYRIGHT: (C)2008,JPO&INPIT
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