Communications: radio wave antennas – Antennas – With vehicle
Patent
1993-01-06
1995-10-10
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With vehicle
343864, H01Q 132
Patent
active
054574684
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
The present invention relates to an antenna assembly for radio and communication apparatus in vehicles, where the assembly is mounted against a pane, i.e. any one of the glass windows, pertaining to the vehicle, and includes an antenna rod fixed to an electrically conductive base, which is mounted on the outside surface of the pane, a connection member coacting with the base and placed on the inside of the pane directly opposite the base, there being a coaxial antenna lead from the vehicle's radio or communication apparatus connected to this member, which comprises a box of at least partially electrically conductive material, with its open side facing towards the base, the box being mounted on the plane with the aid of a non-conductive plate or disk enclosing the open side of the box, the conductor of the antenna lead being insulated from the box and having a connection conductor to a plane opposing the inside of the pane, this plane being situated at the covering disk directly opposite the base.
The object of the present invention is to simplify the connection conductor between the antenna lead and the opposing plane, so that no special means such as adjustable capacitances or the like need be arranged inside the box. The known art is explained, e.g. in U.S. Pat. No. 4,839,660.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention, together with an alternative implementation of a connection conductor pertaining thereto will now be described in the following as exemplifications of the invention, reference also being made to the accompanying drawing figures, where:
FIG. 1 is a side view, in partial section, of a fixing for an antenna rod,
FIG. 2 is a schematic section of the connection member mounted on the inside of the plane,
FIG. 3 is a cross section along the line III--III in FIG. 2 of a connection member having an alternative embodiment of the connection conductor.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The fixing (see FIG. 1) for the antenna rod comprises a circular base 1. At its central portion the base has upstanding lugs 2,3 between which the lower end of the rod is mounted with the aid of a journaling pin 4, such as to enable the rod to swing about the pin from an upright position to a position at 90.degree. thereto, the former being illustrated with full lines and the latter with dashed lines in the figure.
The rod is preferably mounted between the lugs 2,3 such as to coact with the pin 4 via the stub shaft 5 provided with a thread 6 for mating with an internal thread in the rod.
The base 1 includes a disk or the like of electrically conductive material and is mounted on the outside of the pane, e.g. using double-sided adhesive tape 7. Impedance, antenna lobe and efficiency are determined by the length and appearance of the antenna and the base 1. The connection member comprising a box 8 of at least partially electrically conductive material is to form, together with the base on the outside of the plane, the connection for carrying radio waves from and to the antenna to and from a communication radio in the vehicle via an antenna lead. The box has an open side facing towards the inside of the pane and is situated directly opposite the base 1. In FIG. 2 this one side is enclosed by a disk 9, of dielectric material, which may be provided with unillustrated, double-sided tape. A pin 11 passes through the center of the disk 9, and is in communication with a disk 12, which provides an opposing plane to the base 1. There is thus obtained a capacitance connection between the base and the disk 12.
The pin 11 is connected to a connection conductor 13, which extends into contact with the conductor 14 of an antenna lead 15, the latter conductor being insulated from the box 8. The other end of the lead is connected to the communication apparatus in the vehicle.
The intention with the connection conductor 13 is that it will be a simple electrical conductor, not requiring any other connection parts or electrical means in the box. The impedance of the conductor 13 mu
REFERENCES:
patent: 4839660 (1989-06-01), Hadzoglou
patent: 4875051 (1989-10-01), Blaese
patent: 4882592 (1989-11-01), Studer, Jr. et al.
patent: 4916456 (1990-04-01), Shyu
patent: 4931806 (1990-06-01), Wunderlich
patent: 4999642 (1991-03-01), Wells
Allgon AB
Wimer Michael C.
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