Communications: radio wave antennas – Antennas – With vehicle
Patent
1996-09-05
1997-07-08
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
With vehicle
343711, 343767, 343770, H01Q 132
Patent
active
056466374
ABSTRACT:
A slot antenna has a substantially reduced ground plane by defining the slot within a loop of a narrow conductive strip, for example a deposited metal, around a slot opening less than one half the wavelength of the intended signal frequency to be received by the antenna. A conductor such as a central conductor of a coaxial cable coupled to the conductive strip on one side of the slot, while another conductor such as the ground shield of the coaxial cable is terminaled at a position across the slot from the central conductor terminal. In addition, the gain and bandwidth of the antenna may be improved by adding a similarly constructed loop or loops of slot antenna in parallel to the first slot to form an overlapping series of loops. Such a modification forms a ground plane with an overlapping series of loop conductors. As a result, the present invention permits a convenient, window mounted antenna assembly, as well as a particularly advantageous combination of window panel of a motor vehicle, as is particularly well adapted for use with remote keyless entry systems as well as cellular telephone systems.
REFERENCES:
patent: 2755465 (1956-07-01), Ramsay
patent: 2825061 (1958-02-01), Rowland
patent: 2923813 (1960-02-01), Davis
patent: 4973958 (1990-11-01), Hirano et al.
patent: 5012255 (1991-04-01), Becker
patent: 5220336 (1993-06-01), Hirotsu et al.
patent: 5266960 (1993-11-01), Lindenmeier et al.
patent: 5268700 (1993-12-01), Hirotsu et al.
patent: 5285210 (1994-02-01), Sato et al.
Ford Motor Company
Le Hoanganh T.
May Roger L.
Mollon Mark L.
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