US 6,888,508 B2Granted

Active broad-band reception antenna with reception level regulation

AssigneeFUBA Automotive GmbH & Co. KG

InventorHeinz Lindenmeier

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Abstract

An active broad-band reception antenna, in which the internal amplification of the active antenna is lowered if a predetermined signal level is exceeded, and which consists of a passive antenna part having output connectors that are connected with the input connectors of an amplifier circuit. The input circuit of the amplifier circuit contains a three-pole amplification element with its impedance control connector being connected with the first connector of the passive antenna part, at high frequency. The input admittance of a transformation network having the nature of a low loss filter for low amplitude, high-frequency reception signals, has a counter-coupling and linearizing effect in the high-frequency connection between the source connector of the three-pole amplification element and the second connector of the passive antenna part. The transformation network is loaded with a continuing circuit at its output. There is at least one adjustable electronic element, responsive to a control amplifier connected to the output of the active amplifier for adjustably lowering the reception level, and disposed in the transformation network, so that the input admittance of the transformation network, that has the linearizing effect, is reduced, if there is a reduction of the high-frequency reception signal.

Claims46

Dependent claims

An active broad-band reception antenna having a passive antenna part (1), with first and second output connectors (18, 1′) with a frequency dependent effective length le for use on a vehicle wherein the internal amplification of its active antenna is reduced when a predetermined reception signal level is exceeded, comprising;

a high-impedance, high frequency control connector (15) connected to the first connector (18) of the passive antenna part (1);
at least one amplifier circuit (21) having at least one three-pole amplification element (2), with its input coupled to said control connector (15);
at least one transformation network (31) disposed within said amplification circuit (21) and comprising
an adjustable transformation member (34) having at least one adjustable electronic element (32) coupled to the output (24) of said at least one three pole amplification element (2) for adjustable lowering of the reception signal level;
and
at least one low loss filter (3) having its input (6) coupled to said adjustable transformation member (34), and an output connected to said network (31), said transformation network (31), having an input admittance (7, 7′) at its input (24) designed for receiving low intensity, high-frequency reception signals (8), and loaded with a continuing circuit at its output (4);
a control circuit (33) coupled to the output (4) of said amplification circuit (21) and producing a control signal (42) that is fed back to said adjustable transformation member (34) in said transformation network (31) for producing a counter-coupling and linearizing effect in the high-frequency connection between said amplification element output (24) and the second connector (1′) of the passive antenna part (1), so that said input admittance (7′) of said transformation network (31) is reduced when there is a reduction of the level of the high-frequency reception signal (8).

4 more elements

An active broad-band reception antenna having a passive antenna part (1), with at least one output connector (18,) with a frequency dependent effective length le for use on a vehicle, wherein the internal amplification of its active antenna is reduced when a predetermined reception signal level is exceeded, comprising;

an least one amplifier circuit (21) having at least one three-pole amplification element (2, 13, 14)), with its input coupled to at least one output connector (18) of the antenna part (1);
at least one transformation network (31) disposed within said amplification circuit (21) and having at least one adjustable electronic element (32), and coupled to the output (24) of said at least one three pole amplification element (2) for adjustable lowering of the reception signal level;
a low loss filter (3) having its input (6) coupled to said adjustable transformation network (31), and having an input admittance (7, 7′) designed for receiving low intensity, high-frequency reception signals (8), and loaded with a continuing circuit at its output (4) for producing the high frequency reception signal (8);
and
a control circuit (33) coupled to the output (4) of said amplification circuit (21) and producing a control signal (42) that is fed back to said transformation network (31) for producing a counter-coupling and linearizing effect in the high-frequency output of said amplification element output (24) and said at least one output of the passive antenna part (1), so that said input admittance (7′) of said transformation network (31) is reduced when there is a reduction of the level of the high-frequency reception signal (8).

2 more elements

Dependencies are inferred from the claim text.