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Combination wide band antenna and heating element on a window of a vehicle
| Details |
Inventors: Lindenmeier, Heinz; Hopf, Jochen; Reiter, Leopold;
Assignee: FUBA Automotive GmbH & Co. KG (Bad Salzdetfurth, DE)
Primary Examiner: Wimer; Michael C.
Assistant Examiner:
Attorney, Agent or Firm: Collard & Roe, P.C.
An antenna for transmitting and/or receiving in the heating field of a window pane on a motor vehicle. The heating field has an HF-connection designed to couple or decouple high-frequency signals, and heating connections for feeding the heating power. An AC generator generates the heating wattage in the form of AC current, through a transformer. The heating power is supplied to the primary winding of the transformer and picked up on the secondary winding of the transformer and supplied to the heating field via heating connections. The primary winding and the secondary winding of the transformer are insulated to reduce the transmission of high frequency currents so that the heating field antenna does not have low resistance even at the lowest frequencies. |
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DETAILED DESCRIPTION The invention relates to an antenna for transmitting and/or receiving long, medium, short, and ultra short wave signals in a heating field of a window pane on a motor vehicle.
For purposes of radio and television reception, long wave signals (low frequency) are in the order of 100 kilohertz, medium wave signals (low frequency) are approximately 500 khz to 1.
5 mhz, short wave signals (high frequency) are 4 mhz to 30 mhz and ultra short wave signals (high frequency) are signals above this range in the FM, VHF or UHF range.
A goal of this design is to reduce the influence in the system between the DC Power generated to heat the heating field and the transmitted and received signals.
The heating field has a HF-connection designed to couple or decouple high-frequency signals, and heating connections for feeding the heating power to the heating element.
An AC generator generates the heating wattage in the form of AC current, through a transformer.
The heating power is supplied to the primary winding of the transformer and picked up on the secondary winding of the transformer and supplied to the heating field via conductors connected at heating connections.
In addition, a rectifier circuit is used to change the AC current to DC current in these conductors.
One end of the rectifier circuit connects to the secondary winding and another end of the rectifier circuit connects to a filter circuit.
The filter circuit is used to smooth out the harmonics in the signals to give a more even DC signal to the heating field.
Connected to the filter circuit are conductors which connect the filter circuit to the heating field.
To have low attenuation of the received signal throughout a wide range of frequencies, the primary winding and the secondary winding of the transformer are insulated to reduce the transmission of high frequency currents.
In this way, the heating field antenna does not have to have low resistance even at the lowest frequencies.
Furthermore, in one embodiment of the invention, coils are connected to these conductors to reduce high frequency signals in the system
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