Diversity antenna arrangement for receiving frequency-modulated signals in the rear window of a motor vehicle with a heating field located therein

摘要

PCT No. PCT/EP87/00297 Sec. 371 Date Feb. 12, 1988 Sec. 102(e) Date Feb. 12, 1988 PCT Filed Jun. 5, 1987 PCT Pub. No. WO87/07770 PCT Pub. Date Dec. 17, 1987.This invention refers to a diversity antenna system for use in a motor vehicle with at least two diversity antennas as well as a window-mounted heater structure consisting of lateral conductors (bus bars) supplying the heater current and heater sections in between. The configuration is such that each diversity antenna has lateral bus bars (4a, 4d; 4b, 4c) and heater sections (2a, 2b) between them as well as a pair of terminals connected to a feeder network (8a, 8b) of the diversity antenna. Each pair of terminals has a ground connection point (14a, 14b) and a tap point on a bus bar (5a, 5b). The tap points on the bus bars (5a, 5b) of the diversity antennas are located such that they are essentially isolated from each other with respect to radio frequencies. The power leads to the bus bars are provided with RF traps (6a through 6d). This serves to optimize the mean signal quality yielded by each individual antenna and to minimize the coincidence of interference in the signals coming from the antennas.