Patent ID: 6867739

Claim:
A diversity antenna system for vehicles which have a heating panel ( 1 ) which is used as an antenna, with the heating panel ( 1 ) having two heating connections ( 17 , 23 ) and/or two heating connecting lines ( 17 a , 23 a ) as well as two antenna connections ( 17 ′, 23 ′), having the following features: an amplifier ( 25 ) is or can be connected to the first antenna connection ( 17 ′) and is or can be electrically connected on the output side to a receiving section or radio ( 27 ), a diversity processor ( 29 ) is provided, which preferably evaluates an IF signal from the receiving section or radio ( 27 ), the first antenna connection ( 17 ′) and/or the amplifier ( 25 ) and/or the receiving section or the radio ( 27 ) are/is connected to the diversity processor ( 29 ), and a device for producing different terminating impedances or reactances of different magnitude is connected to the second antenna connection ( 23 ′) and is operated in particular at least indirectly via the diversity processor ( 29 ), characterized by the following further features: the diversity antenna system can be retrofitted, the first antenna connection ( 17 ′) is formed by the first heating connection ( 17 ), the first heating line ( 17 a ) and/or the first busbar ( 3 ) of the heating panel ( 1 ), the second antenna connection ( 23 ′) is formed by the second heating connection ( 23 ), the second heating connecting line ( 23 a ) and/or the second busbar ( 3 ′) of the heating panel ( 1 ), the device for producing different terminating impedances or reactances of different magnitude comprises a tuning box ( 31 ), and the tuning box ( 31 ) has one or more circuits, via which the magnitude of the terminating impedances or reactances which are formed in the tuning box can be varied continuously or in analog form.