Diversity antenna system

US4914446A · kind A · utility

Inventors

• Heinz Lindenmeier · Planegg, DE
• Gerhard Flachenecker · Ottobrunn, DE
• Jochen Hopf · Haar, DE
• Leopold Reiter · Gilching, DE

Key dates

• Filing date: Feb 12, 1988
• Grant date: Apr 3, 1990
• Expiry date: Feb 12, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q1/1278
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

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.