Pane antenna having an amplifier

• US 5,138,330 A
• Filed: 03/08/1990
• Issued: 08/11/1992
• Est. Priority Date: 03/08/1989
• Status: Expired due to Term

• Current Assignee: FUBA Automotive GmbH
• Original Assignee: Hans Kolbe & Co. Nachrichten-Ubertragungstechnik
• Inventors: Hopf, Jochen, Lindenmeier, Heinz, Reiter, Leopold, Flachenecker, deceased, Gerhard
• Primary Examiner(s): Wimer, Michael C.
• Assistant Examiner(s): Brown, Peter Toby
• Application Number:
  US07/490,767
• Time in Patent Office: 887 Days
• Field of Search: 343/713, 343/711, 343/712, 343/701, 343/850, 455/291, 455/292, 455/293
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/1271 for mounting on windscreens
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them

Abstract

An active window pane antenna for use in motor vehicles includes an antenna conductor arranged on the window pane and being connected via a conductor of negligible length to an input terminal of an active four terminal network also arranged on the pane. The output terminals of the network are connected via a first section of a transmission line to an antenna connector whose ground contact is connected for high frequencies to a ground point on the body of the motor vehicle. The impedance of the first section of the transmission line is not negligible for the received frequency bands and the input impedance of the four terminal network is balanced with respect to the first section. A second section of the transmission line extends from the antenna connector to a receiver.

Claims

1. An active reception antenna arranged on a non-conductive flat supporting piece (1, 12) set in a conductive body (2) of a motor vehicle, comprising

an elongated antenna conductor (3a) secured on the supporting piece;

an active four terminal network (5) having two input terminals (6a, 6b) facing an end of said antenna conductor, and two output terminals (7a, 7b), one (6a) of said input terminals being connected with a connection point (4a) at the end of said antenna conductor while the other input terminal (6b) is connected by a short conductor (9) with one (7b) of said output terminals;

a ground point (10) provided on the conductive vehicle body opposite an edge of said supporting piece;

an output transmission line (8) having a first section (14) extending over a portion of said supporting piece (1,

     12) between said output terminals (7a, 7b) and said ground point and a second section (15) extending over the vehicle body between said ground point and a receiver;

connector means (11a, 11b) mounted on the vehicle body at said ground point to connect said first section with said second section, a contact (11b) of said connector means being directly connected with the ground point; and

said first section (14) of the transmission line having at high frequencies an impedance which affects via said four terminal network the impedance matching between said antenna conductor (3a) and said input terminals (6a, 6b), said active four terminal network including a difference amplifier connected for suppressing in-phase signals, and

two L-shaped conductive strips symmetrically arranged in corner areas of said supporting piece and being connected to said input terminals of said active four terminal network;

one of said output terminals being connected to said contact and to said ground point via the first section (14) of the transmission line.

2. An active reception antenna arranged on a non-conductive flat supporting piece (1, 12) set in a conductive body (2) of a motor vehicle, comprising

an active four terminal network (5) having two input terminals (6a, 6b) and two output terminals (7a, 7b);

an elongated antenna conductor (3a) secured on the supporting piece;

an output transmission line (8) having a first section (14) which is connected to said output terminals (7a, 7b) and has a length (20) introducing a non-negligible impedance for high frequencies between one of said output terminals (7b) and a ground contact (10), said input terminals (6a, 6b) being respectively connected to said first mentioned elongated antenna conductor (3a) and to said first section (14) of said output transmission line (8),

said output transmission line (8) having a second section (15) which is connected to said ground contact (10) and also to an inner connector (11a) of said first section (14) of said output transmission line (8), said inner connector (11a) is connected to another of said output terminals (7a), said one output terminal (7b) being connected with said ground contact (10), said active four terminal network (5) including a difference amplifier connected for suppressing in-phase signals;

two L-shaped conductive strips (13) symmetrically arranged in corner areas of said supporting piece and being connected to said input terminals of said active four terminal network.