Independently fed AM/FM heated window antenna

Details Independently fed AM/FM heated window antenna Independently fed AM/FM heated window antenna

1996-05-31

1998-07-14

Hajec, Donald T.

Communications: radio wave antennas

Antennas

With vehicle

343704, H01Q 132

Patent

active

057811601

ABSTRACT:
A radio antenna formed in a vehicle window is coupled with a radio apparatus using an RF transformer having a primary winding connected between the antenna/heating element and the vehicle body and a secondary winding connected between the vehicle body and the radio apparatus. Preferably, the transformer also has a third winding which connects to a second antenna/heating element terminal for completing the electrical supply current circuit through the heating element. The primary winding and third winding are wound with identical turns and connected so the electrical heating current flowing through each winding generates a flux equal in magnitude and opposite in direction to the other to cancel the flux resulting from the heating current and thus prevent saturation of the transformer. Shunting capacitors cause RF currents through the primary winding and third winding to be equal in magnitude and in phase.

REFERENCES:
patent: 3964068 (1976-06-01), Torii et al.
patent: 4063247 (1977-12-01), Sakurai et al.
patent: 4086594 (1978-04-01), Kropielnicki et al.
patent: 4439771 (1984-03-01), Kume et al.
patent: 4761826 (1988-08-01), Kropielnicki et al.
patent: 5083133 (1992-01-01), Takayama
patent: 5099250 (1992-03-01), Paulus et al.
patent: 5113195 (1992-05-01), Sakurai et al.
patent: 5165057 (1992-11-01), Sharples
patent: 5177495 (1993-01-01), Davies
patent: 5239302 (1993-08-01), Maeda et al.

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