Window glass antenna apparatus for vehicles

A window glass antenna apparatus for vehicles, comprising:

• a defogger attached to a window glass of a vehicle, for defogging the window glass, the defogger including a plurality of horizontal wires constituted of a plurality of thin, narrow conductors and arranged parallelly and horizontally at regular intervals, and bus bars for connecting both ends of the plurality of horizontal wires together;
• a power supply unit configured to supply power to the defogger to heat the defogger;
• a separating coil configured to separate the power supply unit and the defogger from each other at high frequencies;
• and
• a vertical center wire constituted of a thin, narrow conductor and crossing the horizontal wires in a middle portion of the defogger and in a horizontal direction thereof,
• wherein the bus bars cross the horizontal wires of the defogger at right and left positions a ¼ wavelength of a wave applicable to transmission/reception away from the vertical center wire to serve as short stub conductors, and a pair of grounding capacitors is provided to ground the bus bars serving as the short stub conductors, at high frequencies.

A window glass antenna apparatus for vehicles, comprising:

• a defogger attached to a window glass of a vehicle and heated by feeding to defog the window glass, the defogger including a plurality of horizontal wires constituted of a plurality of thin, narrow conductors and arranged parallelly and horizontally at predetermined intervals, and a pair of bus bars for connecting both ends of the plurality of horizontal wires together;
• a vertical center wire constituted of a thin, narrow conductor and crossing the horizontal wires in a middle portion of the defogger and in a horizontal direction thereof;
• and
• a pair of short stub conductors constituted of thin, narrow conductors and provided at right and left positions a ¼ wavelength of a wave applicable to transmission/reception away from the vertical center wire so as to cross the horizontal wires of the defogger.

A window glass antenna apparatus for vehicles, comprising:

• a defogger attached to a window glass of a vehicle and heated by feeding to defog the window glass, the defogger including a plurality of horizontal wires constituted of a plurality of thin, narrow conductors and arranged parallelly and horizontally at predetermined intervals, and bus bars for connecting both ends of the plurality of horizontal wires together;
• and
• a vertical center wire constituted of a thin, narrow conductor and crossing the horizontal wires in a middle portion of the defogger and in a horizontal direction thereof,
• wherein the bus bars cross the horizontal wires of the defogger at right and left positions a ¼ wavelength of a wave applicable to transmission/reception away from the vertical center wire to serve as short stub conductors.