AM defogger grounding system for vehicle window antennas

Details AM defogger grounding system for vehicle window antennas AM defogger grounding system for vehicle window antennas

1999-07-27

2000-11-14

Wong, Don

Communications: radio wave antennas

Antennas

With vehicle

343704, 343860, H01Q 132

Patent

active

061476544

ABSTRACT:
A backlite antenna system for a vehicle that includes a separated AM/FM antenna grid and a defogger grid. The backlite antenna system includes a defogger grid grounding system having an RF grounding strip that is capacitively coupled to the vehicle body through a urethane seal that seals the window to the vehicle body. The grounding strip and an end bar of the defogger grid create an FM slot gap therebetween and provide grounding at AM frequencies. An AM grounding line is connected to the grounding strip and to an element of the defogger grid. The grounding line has a length one-quarter of the wavelength of the FM transmission band to provide a high impedance path for FM frequencies, but a low impedance path for AM and DC frequencies. The grounding strip provides a high impedance path at DC, but a low impedance path at AM and FM frequencies.

REFERENCES:
patent: 5528314 (1996-06-01), Nagy et al.
patent: 5610619 (1997-03-01), Zafar
patent: 5629711 (1997-05-01), Matsuoka et al.
patent: 5641558 (1997-06-01), Noda et al.
patent: 5739794 (1998-04-01), Nagy et al.
patent: 6031500 (2000-02-01), Nagy et al.

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