Active antenna in the rear window of a motor vehicle

US4791426A · kind A · utility

Assignee

• Hans Kolbe & Co. · DE

Inventors

• Heinz Lindenmeier · Planegg, DE
• Gerhard Flachenecker · Ottobrunn, DE

Key dates

• Filing date: Mar 21, 1985
• Grant date: Dec 13, 1988
• Expiry date: Mar 21, 2005

Classification

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

Abstract

An active antenna for the reception of long-, medium-, short-and ultra-short wave broadcasts is arranged in a rear window of a motor vehicle equipped with a boundary conductor enclosing an array of heating elements. The reception of long-, medium- and short-wave signals is made by means of an elongated flat antenna element which is arranged in the window on a free area above or below the heating elements, and the reception of the ultra-short wave signals is effected by the array of heating elements. An antenna amplifier includes a linear amplifying stage connected to the flat antenna element, an amplifying branch circuit connected to the array of heating elements and a common ground terminal connected to the boundary conductor. A frequency separator has two inputs connected, respectively, to the output of the amplifying stage and of the branch circuit, and an output connected via an antenna cable to a conventional radio receiver.