Communications: radio wave antennas – Antennas – With ice clearer or preventer
Patent
1995-12-11
1997-05-13
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
With ice clearer or preventer
343713, H01Q 132
Patent
active
056297114
ABSTRACT:
A window glass antenna device defrosting heaters for use as part of a reception antenna on an automobile window glass panel. The defrosting heaters include at least first and second heaters each comprising a plurality of heater wires disposed on the window glass panel, a first bus bar interconnecting ends of the heater wires, and a second bus bar interconnecting opposite ends of the heater wires. A first choke coil is connected between the first bus bars of the first and second heaters and a battery, and disposed near the first bus bars, and a second choke coil is connected between the second bus bars of the first and second heaters and the battery, and disposed near the second bus bars. The first choke coil has at least two windings disposed around a core, the windings being connected respectively to the first bus bars of the first and second heaters such that magnetic fluxes generated in the core by a first electric current flowing through the first heater and a second electric current flowing through the second heater will be canceled. The second choke coil has at least two windings disposed around a core, the last-mentioned windings being connected respectively to the second bus bars of the first and second heaters such that magnetic fluxes generated in the core by the first electric current flowing through the first heater and the second electric current flowing through the second heater will be canceled.
REFERENCES:
patent: 4914446 (1990-04-01), Lindenmeier et al.
patent: 5231410 (1993-07-01), Murakami et al.
patent: 5239302 (1993-08-01), Maeda et al.
Matsuoka Yoshinori
Murakami Harunori
Le Hoanganh T.
Nippon Sheet Glass Co. Ltd.
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