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An antenna for a diversity antenna system in a vehicle for mounting within the zone of a window pane surrounded by the electrically conductive body of the vehicle, consisting of a rear window pane having a substantially rectangularly or trapezoidally shaped surface and electrically conductors applie

An antenna for a diversity antenna system in a vehicle for mounting within the zone of a window pane surrounded by the electrically conductive body of the vehicle, consisting of a rear window pane having a substantially rectangularly or trapezoidally shaped surface and electrically conductors applied to the surface. A conductive surface in terms of high frequency, and coherent with respect to its edge conductors (12) is formed within the rear window pane. The edge conductors (12) are insulated at high frequencies from the vehicle ground so that each edge conductor (12) of a side of the conductive surface (1) has a minimum length of about .lambda./10. At least one zone of the edge conductors (12) is provided in the form of a low-resistance coupling conductor (12a) with a continuous minimum length of about .lambda./10. The antenna, formed out of the conductive surface, has a pair of terminals with a vehicle ground connection point (2) and an antenna connection point (5) on one of the low-resistance coupling conductors (12a). The pair of terminals is connected to a connection network (4). Furthermore, at least one electronically controllable impedance network (6) is provided, and an impedance connection point (8) is formed, which is coupled to the antenna connection point (5) via the low-resistance coupling conductor (12a). The antenna is coupled to a radio receiver and a rectangular window pane of an automobile serving a dual purpose in also providing a heating to the window.

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1. A diversity antenna for a diversity antenna system coupled to a radio receiver (30) in a vehicle having a vehicle ground, and a substantially rectangular window pane with opposed edges comprising:a plurality of conductors applied to the window pane forming a high-frequency conductive surface (1);

1. A diversity antenna for a diversity antenna system coupled to a radio receiver (30) in a vehicle having a vehicle ground, and a substantially rectangular window pane with opposed edges comprising:a plurality of conductors applied to the window pane forming a high-frequency conductive surface (1); at least one edge conductor (12) having a minimum length of .lambda./10 disposed along an edge of said conductive surface (1) and insulated from the vehicle ground (2); a low resistance coupling conductor (12a) coupled to said at least one edge conductor (12) having a continuous length of at least .lambda./10 and comprising; an antenna connection point (5) disposed on said low resistance coupling conductor (12a); and an impedance connection point (8) disposed on said low resistance coupling conductor (12a) at a distance of at least .lambda./10 from said antenna connection point (5); only one connection network (4) coupled to said antenna connection point (5) and the vehicle ground (2); and at least one electronically controllable impedance network (6) coupled to said impedance connection point (8) and to the vehicle ground point (11); wherein said controllable impedance network (6) varies the impedance of the antenna so that different diversity antenna signals (21) are produced at the output of said connection network (4).