US 4,791,426 AGranted

Active antenna in the rear window of a motor vehicle

AssigneeHans Kolbe & Co.

InventorsHeinz Lindenmeier, Gerhard Flachenecker

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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.

Claims26

Dependent claims

An active antenna arranged in an electrically heated rear window of a motor vehicle to receive long-, medium-, short-, and ultra-short wave broadcasts, said rear window having a boundary conductor and a set of heating elements connected via bus bars to direct current power connections, said antenna comprising

an elongated, flat antenna element arranged in the window on a free area between said set of heating elements and said boundary conductor to receive long-, medium-, and short wave signals;
an antenna amplifier including a linear amplifying stage having a capacitive input connected to said flat antenna element for processing long-, medium- and short-wave signals, a branch circuit for processing ultra-short wave signals having an input coupled to said set of heating elements in said window acting as an antenna element for the reception of said ultra-short wave signals, and a common ground terminal connected to said boundary conductor;
and
a frequency separating circuit having two inputs connected respectively to outputs of said amplifying stage and of said branch circuit to separate said long-, medium- and short-wave signals from said ultra-short wave signals and an output connected to a connector for an antenna cable.

1 more element

Dependencies are inferred from the claim text.